You have mentioned a long list of past issues. These are important, in so far as they affect you now. Problems are kept going by what happens within your mind right now. Beyond this, your history does not matter. I think you are a survivor, a battler who always wins against all the odds.
Depression is like wearing doom-colored glasses.
It makes you see the bad in everything, and ignore the good. In just a short note, in which you were asking for help, you unknowingly managed to say a whole lot of good things about your situation. For example, your husband is a good man and you love him. You write that you WERE jealous of your sister. The implication is that now you are not.