I had twins 13 months after my second son was born and I can totally relate to your feeling alittle overwhelmed right now. You got a lot of good advice. I had a mother's helper, a 12 yr old and it worked out great for us, I would recommend looking around your neighbourhood to see if there is anyone that age. Ours was actually a boy and he was such an awesome help.
I also had an older lady from church come in once a week in the afternoons so maybe there is a way for you to find an older retired "grandma" type who has grandkids who live far away and is just aching to adopt yours:)
As for breastfeeding, I could not tandem feed (both twins at the same time, you don;t have to worry about that) b.c my then 14 mo old would tear the house apart. so I would breast feed one at a time and that would leave my other hand free to grab him out of harms way.If you don;t have a baby sling look into one, I have a Miya wrap sling and I used it a lot, you can learn to breastfeed in them too, and you;ll have 2 hands free!
There are tons on the market so you might have to do a bit of research to find one the suits you but I think it is the handiest baby item particularly for moms with kids close together And try to find a room you can totally 100% baby proof. Put up and gate and hole yourself in. Either his bedroom or your family room, etc. SOmewhere where he can't get into much and you can sit and feed the baby. BABY PROOF, BABY PROOF, BABY PROOF. Seriously, even if you have to get rid of furniture or decorations that might cause a risk for a few years, it is worth it. If you have to get up to grab something out of his hand even one less time per week it is worth it to just get it out of there for now. There are millions of gizzmos out there you can get to baby proof pretty much everything and I seriously would recommend spending some money on that, not just for his safety but more so for your sanity. Look at garage sales if you want to get that kind of stuff cheaper, or go on mamasource asking if someone is getting rid of all their babyproofing stuff now their kids are older.
Good luck K. H