CF, I wouldn't necessarily start to worry yet. Like Vickie said, everyone responds differently. My Mum has recently had a series of cortisone injections in her shoulders for tendon/bursitis pain (she broke both arms up through the neck of the humerus a few months back) and she had quite profound relief within 24 hours. Opposite side of the coin...I've had injections in both my hip and shoulder and actually had an increase in pain for a week or two before the cortisone has really started to kick in.
Think opinion differs on what sort of activity to do after... I know both my GP & physio advised a couple of days rest after each injection before trying to return to normal exercises, but I've heard other people advised the total opposite.
Hope you get some relief soon.
Moderator - Chronic Pain Forum
Full body CRPS, Dystonia, EDS, Dysautonomia (multiple issues) Osteoporosis, Fibromyalgia
SCS, Intrathecal Baclofen/Morphine pump, multiple oral meds - feel free to ask.