In reply to pork pie girl:
Ouch, sounds nasty. After something similar recently (ring finger left hand, pain in the forearm after an open handed move) I was advised to ice immediately after the injury (24-48hrs).
This helped, as did staying off it completely
and gentle stretching during the recovery phase (after the initial damage-limitation repair bit) to ensure the muscle tissue damage didn't build up lumpy scar tissue as it healed.
This fellers website has a few useful articles on this type of thing, I thought it was helpful (ymmv).
http://thomasbondphysio.blogspot.co.uk/p/contents_7.html
Hope its not too bad - mine was painful in the way you describe for about 4 weeks, then less so for another 4 weeks or so. I went back to climbing after about 6-8 weeks. If you're desperate to climb you could however do this ahem.
Best of luck
f