(((MandaMay)))
Have you talked with your doctor about the mood stabilizer not providing much relief to you? Perhaps a higher dosage, or adding a secondary medicine will help make life a little more manageable.
It is very sad that you are having difficulties with your marriage. You've got a lot of stress going on in your life, which often affects marriages. I know that my ex-hub couldn't take all of the drama constantly occurring in my life. It was very sad for me, when he declared in marital counseling that he couldn't take anymore. It was the end. I do recommend that you try to work through your problems w/ your hub in counseling. Hopefully, you two will find the strength and devotion that you need to make your marriage more solid and happier.
Regarding your family, that just makes me so sad!

Their negative banter is only hurtful, not helpful for anyone.

Maybe you should have fewer interactions with them to keep yourself feeling a little more positive abut your life & who you are.
Gentle hugs sent your way....best wishes!