When I broke my arm a month and a half ago, it was the same thing. Yes, it didn't work very well, but it didn't hurt all that much and I rode out (mostly one handed). 3 hours later, I could only move it an inch and the X-ray images show it is broken.
Pain dropped off over 3 days and I could do almost everything with 1 hand. (probably a thermostat too.)
Pain dropped over the next 4 weeks as it healed and I got back on the bike 2.5 weeks ago. I'm still lacking SOME mobility and lots of strength, but, it is getting better, not worse.
Check out the "rider down" forum on MTBR for shared recovery experiences/tips.