When I get high on pot I start feeling really ugly and I am 100% convinced that my boyfriend doesn't like me anymore and my friends think I'm stupid and/or obnoxious. I don't have these thoughts when I'm not high, but they're so vivid and seem so real every time. I can't even really effectively pysch myself out of these feelings until I come down. Is this common?
As for the girl with the problem, Pot depletes the serotonin in your brain. That regulates your emotions. You need to quit smoking pot and try a serotonin reuptake inhibitor. It will help you to feel happy and normal again. I say to try the reuptake inhibitor so you can replenish what the pot has made you lose.
I have a smoking buddy from college days and developed full blown schizophrenia from it. Ended up robbing his local shop with a kitchen knife so they put him in a mental hospital. The case went to court and the only way they would release him was if he subjected to monthly dope tests to make sure he wasn't going back on it. He's made a full recovery now, thankfully.
Be careful with your mind, there is a very fine line between being sane and insane.
basically,
try asking yourself why you feel that way and you'll find the answer