Have Hope, it seems that you are dealing with psychic vampires (or energy vampires)... people who suck energy from us and drain us... you can look this up on the internet there are lots of articles on the net.
Here's a sample from YouTube:
The dynamic you have with your 'friends' certainly sounds toxic. Being a good friend should be a two-way street and care should be reciprocated.
You said: "I think I need to back off from them and take care of myself." That is exactly what you should do.
So sorry you're going through so much and don't have friends you can rely on.
It might be too much to cut them out of your life right now considering all the changes that are happening, but you can put up some boundaries. Like cutting them off and saying "X, I was just on my way out, we'll have to talk another time." Prepare a few of these stock phrases ahead of time, so you have a game plan and strategy in place.
Peace and best wishes to you!