Dear Aru !
You really have a tough time but it all depends upon your hubby's will power & ability to take right decisions on right time.
Talk to him about that. You're serving that only adds up some money in his income or family income, I must say. Try to convince him. Remind him about the importance of your job when he was passing through a rough phase of life.
Rest ! don't worry much. This is a phase too & it would also fade away soon.
Hey sis first of all let me tell you that you are AWESOME you rock as well for putting up with all of this until now. You earned money when your hubby was down and supported him but now it is his turn to support you in every way possible because now it is your turn. Oh as for your MIL tell her that she needs to stop all this and who the hell are they to send you to your parents house. I will tell you some thing first find out about child support and legal ways to get money from your hubby if you need to quit your job to save your merriage because if you have something legal he will have to give you the money no matter what and that will save you from bagging him to get some allowence.