rr,
I had an injection on Oct. 24 and was scheduled for another 3 weeks later. Since I seemed to be getting steadily better after the first injection, the doctor thought it would be reasonable to wait and see. He suggested (at least in my case) that the improvement was a reason not to try another injection. Since the injection helped me, when nothing else has, and I know that I only get 6 a year, I am happy to try and spread it out for as long as possible. If my pain had been worse, I wonder if I might have felt more desperate, and been more tempted to try another right away.
Good luck,
heboy