Ants 🐜 under my skin

I have fibromyalgia too and experience this crawling sensation. Especially after eating sugar.

After taking any meds, supplements, over the counters? If so possibly Akathesia?

I've gotten that too. Just had that feeling in my left bicep.. felt for maybe a pulse sensation but nothing.. just a feeling of crawling under the skin in one spot.. happens all over though.

You could ask you're doctor about it. Maybe it could be a anxiety thing?

Have you asked your doctor about it? If you are taking any meds, maybe it could be a side affect? Though not exactly the same as your symptoms but I can relate on some level. I have restless leg syndrome (RLS). The feeling is difficult to describe but the result is the sudden, intense, and persistent need to move my legs. The feeling ranges from being localized in one part of one leg to the entirety of both legs. I take a med for it and as long as I take it regularly, I can keep the symptoms at bay. I hope you find your answer to what you are experiencing and find a way to cure, or at least, manage it!