Everyone has their bad days. Everyone has times when they make stupid moves. The difference between the good players and the bad players is that they can see the difference between the two. So look through your hands and see which it is. Bad moves are fine, as long as you learn from them so you don't repeat them.
If you've had a particularly horrible session, take a day or two off. However long it takes to "forget" about the bad day. Vent to friends or someone, it sometimes helps. If you are focused on the loss your previous session, you won't be playing your best.
Second. Microstakes are easier than higher stakes, but microstakes have more variance. people will suckout on you more because they will stay in the hand more with crap to catch their miracle rivers. Expect to have crap moments because of it.
So, my advice. Take a day, casually look over the hands to see if you did anything wrong. Adjust if you did. If you can't tell, post the hands here on the hand-analysis forum (great, great resource btw, I really recommend it). Take any lessons you can from it, and play poker again when you feel you can put the bad day in the past (could a be an hour afterward, could be a week afterward. Only you can know this one.)