I'm having my first one done Wednesday. I have had all sorts of injections , blocks and a rhizotomy when I broke my back. But I don't think I've had one of these done...

So my question, when I have had injections with steroid in my shoulder and the recent 3 in the joints on my affected thumb and wrist, I had terrible flare. I was told that was normal for steroids. My hand got worse after the second and third, is it possible the first one started the crps? I've had no injury for years and was told likely repetitive movement (cutting hair) could have.
Am I at risk with this of getting it in my neck?
Also are flares "normal" with the sympathetic nerve blocks?

I'm just not sure what to expect and when I don't know what to expect I get really nervous. Guess I like to know it all lol