Hello roxiannabell,

to Psych Central!
It doesn't sound to me as though you're complaining about anything that is your husband's fault. No, I don't think that you made a mistake in marrying him (at this point). Rather, it sounds as though you two are in a very tough spot trying to make it work.
Working for family can often be a complete nightmare! I know, I've done it a few times.

We often get pushed into working ridiculous hours, being underpaid, feeling guilty and angry. NOT a good situation at all.

I understand very well how you're feeling in that department. It sux!!
I highly recommend that you and your hub sit down and talk openly about exactly what is going on and how unhappy you are living there. I would expect your hub to have some mixed emotions about the whole situation. It would be really helpful and bonding if you two could work together on coming up with a plan on how to end the path that you're on now. Perhaps he needs to sit and talk with his family and firmly request some peace for the two of you; ask his mom to stick to your scheduled hours of work, rather than pushing additional days and hours without pay; etc. Maybe he doesn't have that type of relationship, in which he can speak that openly with his family. If not, that's something that he's going to have to work on if you're going to make any progress.
Don't give up though ~ give your hub a decent chance to really try to improve things first. From there, the two of you can talk about looking for work elsewhere & improving your own small family life.
Very best wishes to you both!