Continue to breastfeed if it is working. Baby could be colicky due to a number of reasons, perhaps supplementing with a soy based formula will likely help with that. Or, you can pump... breastfeed, and supplement with your own breast milk in a bottle, so your husband can help feed the baby and it can cut down on the colic.
Explain to your husband that things would be less stressful if he was there to help. It's so not fair he abandons you in a time of stress just so he won't have to deal with it. As far as chores and cooking goes, he can certainly pull his weight and do more around the house. Have a meeting with him o things he can do to help. My husband is amazing at helping around the home, some men just don't get it that they need to contribute as well.
Do you have friends who can take the older child for few hours a day or two a week?
I nursed both children until they were about 16-18 months. It's always more in the first few months. I was doing the same as you with my first, it felt like I was always nursing. My pediatrician told me the baby was nursing as a comfort and basically using me as a pacifier and it would be okay to lessen the feedings. So long as your baby is still have a healthy amount of dirty diapers and is gaining weight, he/she is going to be okay.
Also, try baby wearing. You can nurse or feed your child while he/she is in a sling and you can still cook/clean... while doing nursing.