Need advice! Nothing seems to work. - Sciatic nerve pain

So my sciatic nerve and been bothering me for several years now. I worked as a delivery driver 5 years now and honestly I don’t know if that’s the cause of my nerve issues. It’s only been a few times where the pain was at a 9 or 10 but mostly it’s just discomfort. I find it hard to sit down on my couch or recliner without it starting to tingle. When I sleep I can’t lie on my left side or even on my back without it tingling into extreme discomfort. I end up falling asleep on my stomach and that causes lower back and neck pain. The only thing that keeps it from bothering me is standing or moving around.

So I decided to go see a chiropractor on my route to see if it had something to do with spine. (Also got a new bed…didn’t work) He did examined me and said it was possibly my piriformis muscle that was the issue. They did several shock therapy on my left buttocks and put some icey/hot like ointment on my problem area for the next few weeks. I’ve done piriformis stretches and also heat and cold pads. All this and it feels like it’s gotten worse.

I’m at a point where I need some outside opinions on how to handle this issue. From what I’ve read, it can get worse if not treated properly. I have very good health insurance and will take any advice on a specialist or doctor to help. Any other advice would be greatly appreciate!