Suggest Treatment For Sharp Pains In Buttocks And Back Of Legs

I have lower back pain from budged discs in C4 and C5 areas. I have had to sessions of cortisone shots - 1st time back in November 2013 (3 shots to my lower back) and the 2nd session around the end of March 2014 ( 4 shots to my lower back). Since the last sessions, I have played golf and started doing more yard work of bending and squatting, cutting my grass and edging the lawn. I m starting to feel sharp pain again in my buttocks and the backs of my legs. I m I looking at cortisone shots again or should I be looking at having surgery or are there other forms of help besides the cortisone treatments?