Oh, honey. You sound so stressed! But you also sound like a wonderful mother--congratulations to you on your breastfeeding relatioship. I hope you never feel apologetic about meeting your child's needs in sensitive, responsive and intuitive ways.
Here are a few thoughts:
"How Weaning Happens" is an excellent book and could be a great resource for you. You can find it cheap online or borrow it for free from your local La Leche League group. You can find LLL and a Leader near you at www.llli.org. I notice you are in Salt Lake; there are several Leaders in your area and all the ones I have spoken to are excellent and their suggestions are respectful and medically accurate. They can offer you free phone help, and if you attend a meeting (which I highly recommend) you could chat with other moms about weaning and get feedback from other experienced breastfeeding moms with respectful parenting philosophies. Plus, you could borrow "How Weaning Happens." That book helped me a lot; it's not at all the same old stuff, but has lots of strategies and ideas I have not found anywhere else.
It's important to remember that weaning is a process, not an event, so it is vital to do it gradually. From the first time your child took a bit of solid food, he has been weaning. If you wean abruptly, you risk getting engorged and setting yourself up for mastitis, and you sound too busy to put up with that! ;) It takes your body about 48 hours to adjust to an increase or decrease in milk supply demand, so dropping one nursing every three days would be as fast as you'd want to go to stay healthy, but that would be really fast, considering emotions and all. I would think going that fast would only be advisable if you were facing some kind of medical emergency and needed to stop nursing.
I agree with your friend who mentioned the possibility of pumping if you must be away from Baby. If you and your baby are not yet ready to wean, you do not have to. One year is by no means a cut-off point. . . it's the minimum amount of time the American Academy of Pediatrics recommends a baby be breastfed. They said to continue "as long as is mutually desired by mother and baby." The World Health Organization and the last U.S. Surgeon General recommend nursing to age two, for added protection from allergies and other chronic health conditions, so really, you're under no pressure to wean from the medical experts. Everyone else can go jump in a lake if they try to pressure you; you're the mom and you're the expert on your baby, so you will do what's best for the two of you.
You say you're concerned about grandparents being stuck having to soothe a breastfed baby to sleep in other ways. . . but that sounds normal to me. Even if he is weaned, don't you expect they will need to soothe him to sleep with lots of rocking, singing, snuggling and stories? Taht seems like a healthy, happy, people-oriented way to go to sleep. I think they expect that, so I personally don't think his being weaned or still breastfeeding will make a huge difference in how they care for him.
My third son is the same age as yours --born last August-- and if he wakes up early in the morning while I'm at the gym, my husband just snuggles up next to him and they both fall back to sleep. (We don't even bother offering him a bottle anymore--he's so insulted by it, it cracks us up. Coach is such a bummer when you've always flown first class, you know?) I honestly think grandparent cuddles will be an adequate subsitute for nursing for those four days, if you really must leave him.
Keep in mind, too, that you must wean *to* something. You can't simply cut out something this important to him without finding something else to fill the void. With little babies, that typically means artificial baby milk. With older toddlers, you have so many more options--you can wean to extra snuggling and stories, healthy snacks, games and puzzles, walks in a sling or backpack, quiet songs--lots of fun things.
Regarding, dairy, my first son was horribly allergic to cow's milk and I have been very, very cautious about offering dairy products to my other boys and we don't drink cow's milk as a beverage at our house. When my first son was diagnosed (as a newborn at Primary Children's, since his intestines had swollen shut) the gastroenterologist quizzed me and my husband and we all realized that the reason my hubby is such a picky eater is because he is mildly allergic to several foods. (Duh, I thought.) He does not like things that give him a bellyache. I think babies who are experiementing with solid foods are much the same way. While they often need to meet a food several times before it is familiar and appealing (and no one claims a "cookie intolerance," go figure) I think there is often a reason they don't like something they are not ready for. I notice you're already dealing with reflux issues--it might be appropriate to be extra cautious about introducing dairy, since you don't need any more tummy upset.
More than anything, I think you should find the book "How Weaning Happens" and get in touch with your local La Leche Legaue group. Their meetings run in a series of four, and one of them is actually titled "Nutrition and Weaning."
I offer you my sincerest best wishes to enjoy this lovely season of mothering. Don't rush it or wish it away or analyze it so much you aren't able to just enjoy that little man. My older two sons self-weaned and it was a very peaceful and gradual transition. They are so big and confident and I will never regret the time they spent nursing. Happy mothering!