Stop.
I used to do the casino thing, coming up to about 4 years ago. Did it for only 6 weeks, made about £3-4k. I had a load of money (winnings) in a netteller account and to withdraw it decided to withdraw via a casino. Had to play through it about 5 times to withdraw and was playing £5/hand blackjack. Was on a losing streak and was getting peed off. Decided to do a bit of reverse sweepering and lost a long streak of hands going £5, £5, £5, £10, £25, £50, £100, £200, £400. I then had enough to play £800 leaving about £500 left in my account so couldn't afford to double again. After about the first 5 losses I knew I should stop but everytime I told myself to a second later I'd have doubled and played another hand without really intending it, I knew at that point I was addicted and it could all go horribly wrong. I played the £800 hand and won it, again unable to stop myself. Withdrew every penny and have not played since (except fruitys). I felt sick that I had nearly thrown away about £3000 in total, and it took me approximately 3 minutes to go from a decent sum to nearly having nothing. If you've made a nice bit of money and are actually worried enough to post on here then you have no question to ask. Stop now and be thankful for what you made while it lasted.