I'm still taking the medication. Scared to stop!
In the 1990s, I had some high ESR readings (erythrocyte sedimentation rate test, which they used as a marker of inflammation before the days of CRP), and high white blood cell counts. I think they eventually put these down to "probably happens to have a concurrent infection". Then no-one tested my blood for years.
I had a few tests in the past few years, though, and my CRP levels were sometimes mildly elevated (usually 7-9), and sometimes I had high lymphocyte counts, which again people just put down to "probable concurrent infection". And my blood platelet counts were consistently high. Which on-one seemed to care about at all.
I managed to talk my GP into sending me to a rheumatologist, at my own cost. Luckily, I was feeling awful on the day I saw the rheumy, so my pulse was rapid, and my glands were a bit enlarged. He also noticed the high platelet counts, which he said is a marker of chronic ongoing inflammation. He thought there was something immunological going wrong and referred me to an immunologist.
The immunologist took it really seriously, did a lot of tests, mainly to rule out immunodeficiency and active ongoing infection. He also gave me a vaccination challenge - three vaccines in one injection, followed by bloodwork for the next few days. My CRP levels shot through the roof (the experience was awful), but I did successfully produce the right antibodies. So not immunodeficiency then. Then he did some genetic tests to try and identify if I had a monogenetic autoinflammatory disease, but I was negative on all of them, which he said was common.
So I had no positive genetic test, and my symptom profile didn't exactly fit with any known autoinflammatory disease, but he wasn't bothered by that, he said we hardly know anything about any of these diseases, and symptomatology is likely to be much more varied than we think. He wasn't going to be bogged down by the limits of the disease models, so he just gave me a working diagnosis of "probable PFAPA" (a common autoinflammatory disease, of unknown genetic origin), and worked on how best to treat me.
What a guy, eh?
After I got my tonsils out, they sent them to the path labs, and apparently they showed evidence of chronic inflammation. So
@Trish, it could have been the tonsillectomy after all.
If you want to see how well you might fit an autoinflammatory disease diagnosis, a good thing to look for is how you respond to the flu jab. Autoinflammatory diseases are characterised by excessive innate immune activity, and the innate immune response happens rapidly, within the first 24 hours after an immune challenge. So if you have one if these diseases, you'll feel awful within the first 24 hours after the jab (although it could easily go on for days or weeks after that). Surgery is likely to have a similar effect, because its also an immune challenge: within the first few hours after the tonsillectomy, I felt like I had the worst flu ever, and it lasted for weeks.