My fiance family.

So my fiance has been gone recently for a month almost, and before he was gone his family treated me bad. But since he has been gone its got worse, we have one car its in his name but the insurance is in his mom's name. "It was cheaper for us to keep it that way for now" but when he left his mom took the car from me, mind you I'm 17 weeks pregnant. She has yet to ask about the baby or about our other daughter. She isn't biologically his but you ask him or her and that's her daddy! Anyways. They have truly shown how much me and my kids don't matter to them and I need some advice. Is it wrong for me to cut them out of mine and my kids life? Am I overreacting? I mean I literally had a anxiety attack one day going to a cook out at his grandma's house because they don't talk to me when I go to things, I'm pretty much ignored like I'm not there. I had to take 2 Xanax just to calm myself down. I have never had anxiety or depression until I had my 2 miscarriages, but should I feel like this?

Sorry for babbling and if things are spelt wrong.