I have a problem....

I play really well when I am ahead, I was able to build a 85 bankroll to 450 in 1 day, but I was playing 1, 2 cash.... way too high of stakes for my bankroll. Yesterday, I had 450, playing cash 1,2 and I was also in a 16.50 buy in and was in first place from the first 5 minutes until the last 20 people. First place was 900 and i thought it was mine for sure, things were looking great...

Then I chased a flush draw, lost about half my stack in the tourney, and got caugh on a bluff to lose another hand shortly after. This put me on tilt, and I also started doing poorly in the cash game. It's almost like i get bored or too confident i'll hit, and stop playing my a-game. this happens EVERYTIME. I have deposited over 10k in the last few years, always in 100-200 increments, and everytime i say i am going to play tight, but i play for too long, and start playing risky. If i'm down 50, i'll do a 50 heads up before my session end justbecause i hate being down. This is a severe case of tilt-itis, does anyone have any similar experiences? I am a very solid player, if i can just overcome this i would have good success, but nothing seems to work.