I get very upset with myself when I make a bad play ...

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Why not drop down and do 50 pushups after playing stupidly?

It gives you time to get off tilt, acts as punishment, and helps you prevent developing a poker player's signature pear-shaped build.

Come to think of it, I should do this myself between hands.

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I dont know if your being sarcastic or not, but this isnt a bad suggestion. I think this could do a number of things for you ...

1. Keep you off tilt. Your sitting out a hand or two to do this, and your focusing on something else.
2. Keep you in better shape. You could mix things up ... one session nothing but push ups, another nothing but sit ups, etc. It wont make a drastic change, but hey, its better than nothing.
3. Help your play. With a punishment you will be less likley to make such a mistake again.
4. Have another hobby. All you guys who play online for 12 hours a day and not much time for anything else, could say that you have another hobby. You work out.