So did you skip 15mg? If so, that's a very large drop and steroid withdrawal pain might be catching up with you. Did your doctor give you a reduction schedule?

You really need a prescription for smaller dose tablets, 5mg and 1mg, to keep the dosages accurate, especially important from 10mg and below. I wouldn't attempt to split a 10mg tablet 3 ways. It's not accurate and accuracy matters as you reduce.

Those dosage-decrease increments would probably not by themselves be causing problems, but it would be helpful if you could also tell us about how long you were on each dose. Good luck.