First of all thank you all for information and advice you posted in the last few days.
I have been feeling so awful over weekend that I think I had already decided I will take the 15mg Prednisolone. I was at GP this morning and asked lots of questions. He said that the side effects should not be as bad this time as 15mg is a moderate dose whereas last time it was much higher, he also reiterated what you all said, it would be advisable to take the Pred as the side effects would be better than the pain from PMR and the risks involved in not taking it. I will let you know how I get on.