Oh, you poor lamb. Enough is enough,there is too much there for you to deal with.
What happened to you as a child was too awful, but,you overcame it and went on to marry.you also battled harder to get a masters,clever you.what an achievement?
.so we know you are brave and resilient.it is very,very hard,but can you let all the nastiness of your life go. The money,the abuse,the insults and the cruelty. It is done and can't be changed,although it ought to be. So,it is destroying your future life. Is there anybody that you trust, I suggest,not relatives, to get some counselling,or cbt,or even hypnotherapy. In my opinion you need to get on forward,and get out of the rut of despair. I also think a gp that is helpful can give you a mild anti depressant. Make up your mind that ,the new you,is going to hold her head high. Not be bogged down by events that nothing can be done again. Good luck. I hope you find the peace you need and deserve.