Riding the waves

I would grade my play lately at about a D but I have had moments of absolute clear headed top level play. It feels great calling a maniac down in the 2/4 limit game with just A high and knowing your good, or deep in a tournament calling a pot sized bet on the river with just middle pair weak kicker when I know the guy missed his draw and is just trying to pull a Moneymaker. Last night was ROUGH, at one point I was down over $400 then climbed back and caught a few breaks to finish the night with a HUGE $12 profit. I need to find some way to gain better control over my emotions.