While there are good arguments for Lyme as a trigger or for persistent triggering, its less strong for long term causation. Similar arguments apply to herpes and enteroviral infections, plus Q fever.
Maybe so, but an IV antibiotic which is often used for Lyme and gets into the CNS was very helpful for me. I had a textbook Hermxheimer reaction, which should only happen in response to very specific types of bacteria - only spirochetes which produce toxins as they die off.
My personal experience strongly suggests a long-term Lyme infection, and it is this far strongly suggesting that 6 weeks of IV antibiotics has a big impact on Lyme and ME symptoms. For the past 5 days I have been incredibly active by my usual standards. I got a little sore the first couple days, but nothing resembling a crash, and now I'm able to do many household chores every day, without struggling at all - chores I haven't been able to safely do for a couple years.
And I feel vigorous and rested every morning. I get a little tired after most things that I do, but then within a few minutes of sitting down I'm recovered and trying to think of what else needs doing
Everything is EASY now, though at the moment I'm still progressing cautiously.
Unlike ME/CFS, I had at least heard of Lyme before coming down with ME/CFS symptoms. And I assumed it was one of those usually not-real things which slightly unstable women believe that they have when they don't have anything better to do - maybe because I was such a hardcore Simpsons fan as a kid, and it was clearly portrayed as psychosomatic there:
Miss Hoover: So, you see, children, my Lyme disease turned out to be...
[writes it on the board]
Miss Hoover: Psychosomatic.
Ralph: Does that mean you went crazy?
Janey: No, it means she was faking it.
Miss Hoover: No, actually, it was a little bit of both.
Yet treatment targeted specifically at Lyme produced a reaction in me which should only occur in response to Lyme or Syphilis. And two weeks after the first round of antibiotics is done, I feel freaking awesome. Which raises three possibilities: 1) I was delusional regarding my Herxheimer reaction and my current improvement, 2) the antibiotics had a positive impact due to treating something other than Lyme, or 3) treating a 20 year old infection with IV antibiotics targeting that infection has produced the expected reaction and improvement that should occur when killing off Lyme.
I'd prefer to think I'm not delusional - past experience has been pretty conclusive for me in that regard. While I have had shorter term improvements in the past for various reasons, I didn't imagine them or cling to them after they were actually gone. It also seems unlikely that I had Syphilis instead of Lyme, or that I had some other unknown spirochete-based illness - after all I had dozens of tick bites when I was 13 and 14, and that's when some of my more minor symptoms started.
Hence in my case, a long-term and variably active Borrelia infection seems like the simplest and most logical possibility. And many others seem to have a very similar experience.