Good morning @jeanniem. Here's a video from Dr. Sletten of the Mayo Clinic's Pain Rehabilitation Center presenting on Central Sensitization Syndrome. It's the best way to learn about CSS:

There is success in treating CSS, and it revolves around a holistic approach because of the way CSS is heightened by some medications, stress, anxiety, pushing and crashing etc...

I was in your boat where tests were negative or inconclusive, nothing made sense and doctors had no answers after 3 years of searching. Yep, I had small fiber neuropathy, neuralgias, migraine, sleep disruption, depression, anxiety, all that. I learned that central sensitization is this big umbrella over many diagnoses.

It can't hurt by learning about CSS. I always say it's good to have in your back pocket in case all else fails. Do you mind getting back to me with your thoughts on the video and whether any part resonated with you and your circumstances?