I fell down the stairs and now have numbness, inability to bear weight, and swelling in my right wrist. im wondering what i should do?

Get care ASAP: You may have fractured your wrist, in a way that is compressing a nerve. If so, the joint may need to be set (maybe requiring surgery) very soon to prevent permanent nerve damage and partial paralysis of your hand. Don't mess around with this: get care right away, even if it means a night-time visit to an urgent care clinic or hospital emergency department. Good luck!