Like Ginnie, he should have given you more notice so you could have made an informed decision about this. He didn't even tell you what he was going to use! How are you supposed to make a decision on this?
And in my "uneducated" opinion, that's too much steroids to be used at one time. These are not good for the body, for one thing and to do so many at one time is not a good idea!
At any rate, give it some time. If you find that you don't get any relief from these, DO NOT LET HIM DO ANY MORE. If this first "round" of injections don't work, then the rest won't work either.
I had a bunch of injections, but this was before the internet, and before I could do any research to speak of. If I'd known what I know now, I never would have had them. I never got any relief either.
Best of luck -- I hope you DO get some relief. Take care and let us know what happens. Hugs, Lee