Welcome to HCM.
The doctor should've warned you that often the pain is worse after trigger-point injections for the first couple of hours. You need to keep as still as possible and an icepack to the area of most pain will be of benefit. Using some Tramal orally will help for the pain. If this problem persists it is possible that a nerve
was injured with the injection and you need to get back to your doctor. I trust this information helps you.