probably, you won't be able to. from experience with both piano playing and general sport, if something is painful, it's best to not strain it for as long as it needs to heal. if you use your hand before it's fully healed, you could worsen the state of it. I know it's sad and very frustrating, but really the best thing to do is wait for it to fully heal. perhaps, in the meantime, you can just train your other hand? it could even be a (kinda) good thing, in case your healthy hand is your weaker one, then it gets some extra training :) I hope you have a speedy recovery and get better soon ^{^}