I heart my hand very very badly at gymnastics what should I do
I would take an ibuprofen and ice it if it swells.Try to decide if anything's broken.Consider going to the ER for an Xray.
You love your hand? ;) just ice it, put a heating bad on it, stretch it out
Try some stretches; It might just be a strained muscle. If it doesn't work, I advise you to go see a doctor. It's probably not a big deal, but they can tell you what is wrong for sure (and they'll fix you up).
Only way to know for sure is to see a doctor, in the mean time, use the other hand.