I feel like I’m losing my mind

As the title states, I feel like I’m losing my mind! I’m ttc and bipolar and the medications I take are very dangerous for pregnancy in general so I weaned off them. I’d completely forgotten what it’s like without them. I get so depressed, like can’t get up and brush my hair depressed. And I get so frustrated and irritated with so much... I’m living with my biological family until I move into my apartment (in a month) and I have a one year old who I feel so protective over.. and my half brother, I think I might actually be near hating him. He is so disrespectful to me and my parenting! He never listens to me when it comes to boundaries with my daughter. He always makes her so upset and I keep trying to make him stop by taking her away each time but he won’t learn! I forgot to mention my fiancé live here too! We buy ourselves food and stuff and they keep stealing from us! We never have lunches or snacks or dinners! It’s horrible! My bipolar disorder accentuates my anger and frustration. If I could I’d move back in with my adoptive family, but I feel completely cut off and abandoned by them. They always try to point out that I’m a disappointment and a failure.. I don’t know what to do. If I didn’t have my daughter I’d totally take up being homeless again.. I can’t stand living somewhere when I feel totally disrespected and unwanted. I’m even considering couch surfing... I don’t know what to do... I’m going crazy!