What has happened to you is something that most players go through, and although it sucks bigtime you will NEVER make the same mistake again, and this is a lesson of huge value. So don't be disheartened - find yourself a limit within your bankroll (which is what, btw, now that you've lost most of yr profit?) and play form there - if you're a good player your roll will grow and you'll be able to move up in stakes when it does.