You will only end up regretting, that’s the most possible consequence. Gambling is a game of knowledge and skills, analysis and strategic bets, so how would you showcase them if you yourself isn’t prepared enough and is not capable making it at the present.
Simply put, you will only lose and drain your wallet. You don’t have focus and presence of mind, that it’s hard for you to even attract luck and chances.
So you mean having knowledge and skills and knowing how to analyze and strategize? I don't know if there's an advantage if you have these.
Mentally stable or not, gambling will still be a game of luck no matter how capable you are of analyzing it.
If you are mentally ill, you better stay away from casinos because it's not the right place to treat any emotions and mental disorders because if you lose in a casino, I'm sure it would make it worse.