K.P.
A very dear friend of mine was horribly sick through the first six months of her pregnancy. The only thing that helped her was chewing on raw ginger root- you can buy it at most grocery stores. There was a three month period of time when all she could eat were popsicles- so her husband stocked the freezer with the 100% fruit ones.
It is possible that your stress is impacting your ability to sleep. Is your toddler in daycare? If not, could you possibly enroll her for a few hours each day and take that time to do some "light" housework and nap? It sounds like you need some help around the house more than anything right now.
Budgets are very tight, but I would strongly suggest hiring someone to come in for a few hours each week to clean and get some meals in the fridge/freezer for your husband and daughter. We have someone who does this and it has been incredibly helpful. Most housekeepers charge around $20/hour. We did not use a service b/c they typically don't offer someone who will cook. I called some friends and got the names of their housekeepers and we found someone who has been a lifesaver for us!
Good luck and know that the end result of all of this will be a beautiful little baby that you will love!