I like the idea of setting limits. I do everything to the extreme too. I think it's part of being an addict. I've found that now that I'm not drinking, my extreme behavior has transferred over to other things, like food. Especially sweets...I can't stop eating lol. Now that I know when I sit down with a whole gallon of ice cream that I'm going to eat the whole thing, I have just stopped buying it.
You're still very new to sobriety so don't be too hard on yourself. One thing at a time....over exercising it indulging right now won't kill you. Drinking will.