Had it ever since I contracted mono in my 20s… it was almost overnight after the high fever. I’m 61 now… have had nerve blocks don’t work the actual injection caused a nodule/swelling at insertion sites at either side of occiput - took weeks to finally absorb. I live w it and can’t sleep on my back… occipital area and neck were never the same after mono as well as upper back and joints. I take Advil once in a while, am on Cymbalta for fibromyalgia finally diagnosed but it doesn’t help. Also have Menieres and tinnitus. Good luck, everyone is different, maybe you’ll find something that works. Stress contributes greatly but I believe there must’ve been some EBV (Epstein Barr virus that causes mono) nerve damage when I had mono.