Okay, the FIRST time I went for a cortosone shot, I was scared sh*tless. It hurt, and what was worse was I heard a popping noise. Yes the thumb went numb for awhile, and the pain was severe for a few days, but after all that went away, I actually liked having the shot done.
Since June, my thumb has progrssively gotten worse, and im scheduled in for another shot next Tuesday. My family doctor doesnt think that the inital shot worked.
After this shot, if it continues, I am opting for surgery.
Best of luck to you, and I hope that your injection helps. Ibprofin is your best bet for afterwards. it reduces the inflammation.
Cheers