I've been having frequent siatic nerve pain in my lower back, which sends aching pains down my hips, thru the back of my legs, furthermore, leading to my feet and having a tingling sensation. I have read several different reviews about this shot and am scared of getting it, but am in dire need of relief. I have had this shot in the past for a migraine, which made my head burn. Any suggestions/recommendations for getting the shot or comfort without it?