You are going though so much. From what you say it sounds like your father might be bipolor too and is using alcohol to self medicate.

Whether is alcoholism or BP you've lost a big anchor in your life. Losing him might have felt like being set loose on the wind, then to have your mom being so overwhelmed with other things is the lost of another anchor. Even if logically you understand why your mom isn't able to be fully there for you it's so hard to lose that. On top of all that, to have your boyfriend suddenly leave you must feel terribly uncertain that you can ever depend on anyone. People here get that and we'll be right here listening.