Originally Posted by kevkojak
The other suggestion is getting some help for your addiction.
if you can't control the amounts you play with, you probably should not be playing poker or do any kind of gambling.
If you do want to keep on playing - and i doubt you should - you need to learn proper bankroll management, otherwise, you will always be going busto. If you have some notions of math, check out Wikipedia to figure out why.
Just so you know, i personally want a bankroll of at least $7000 to consider sitting at a $1/$2 nl table, $14000 for $2/$4, and that's not even very conservative. With $750, you should be playing $0.10/$0.25 at most.
To answer your specific question, PokerStars
allows you to restrict the higher cash limits you want to be able to play. It's in Requests/Responsible Gaming/Restrict Table Limit. I'm not aware of any other room that offers this.