Re: Feeling like my marriage won't be able to survive
Where is your husband going to stay when he is working out of state? Is moving with him to that state an option for you?
The overbearing and controlling In-Laws is a big deal, and will make it much more difficult for you to move forward in a positive direction.
If you are forced to stay with the in-laws you must work extra hard to establish healthy boundaries. It is imperative that you explain to MIL that her behavior toward you and your children is placing extra stress on you during an already stressful time, and that MIL needs to make a significant effort to respect you as an individual and a mother.
Provide MIL with a list of meals that you deem appropriate, as well as a list of food you do not want your kids to eat.
Look into some type of summer activity program for your kids, there are sometimes state sponsored services of that nature for low income families. While your kids are attending these programs, try and find a part time job. Worst case scenario, you become a waitress or a secretary part time somewhere, and if all else fails, you may volunteer your time at the local library. That will get you and your kids out of the house and away from MIL for at least a part of every day. It may be a good way to network and eventually find a good job for yourself.