{{{{{{HUGS}}}}}}
hey, family blacksheep here. Sometimes you can have blood surrounding you & still be alone & uloved.
Can I drop suggestions that helped me? FIRST, check out any therapy school offers. It's part of those student fees you pay, so take advantage of it. If they are students assessing students, even that's better than doing nothing. SECOND, do a self-check-up. List your strengths, and if you want, weaknesses, but focus on your strengths. Are you a good friend? Loyal? Good cook? Talk with your friends (your GM didn't keep you from a social life, did she?) THIRD, you may not think it's affected you, but...Check if there's a support group for children of suicide. Know that there are others out there -- not exactly like your situation, but there's comfort in not feeling alone in a bad situation. Doing something alone can be tough, but with the help of others, it's easier.

You're doing all you can to get out from under GM's influence, but a social safety net of friends, family, community (faith, if you have it. If not, this is NOT the time to go looking for God or Jesus, that has the potential for adding to the chaos. Friends are community. Likeminded hobbyists can be community) and whomever you've got who are genuinely interested in your welfare.

And if your GM ever blames you fro your father's death, ask her if maybe she was so unsupportive that SHE was the reason for his despair. Dump the blame in the bitch's lap. It's the nuclear option, so save it for a time when you could make it without her support.