take a popcycle stick and wrap with gaze with it under the thumb you have a bad sprain it needs rest so keep it immoble not moving with the stick it will take weeks to heal remove for a shower only
Could be broken, or just bruised. Only way to know is to go the doc for an xray. Hope it's okay.
you could have just jammed it really bad. i play volleyball in college and i had another girl dive right on my thumb when i went to the doctors for it they said even if it was broken jammed or whatever they could do nothing. just ice it and take advil as needed for pain. it'll be sore for a while but everything will be okay (: