I was on a steroid taper for about a week after my craniotomy.

Steroids can raise your blood sugar, but that's only a problem if you're Diabetic (I am), or if you are on large doses, for a long time.

I had a couple of steroid injections into my right ankle 15 years ago - and it gave me immediate relief of the pain, and the pain didn't come back for about a month. In that case it was used as a diagnostic tool. The fact that I had relief proved his diagnosis. Then I had surgery to fix the problem.

I think you'll be fine for the time frame your doctor is prescribing.