AFAIK, there is currently no scientific evidence supporting the idea that mRNA vaccines uniquely "treat or cure long COVID" through other mechanisms.
[1] Brain imaging before and after COVID-19 in UK Biobank https://www.medrxiv.org/content/10.1101/2021.06.11.21258690v...
[2] Brain Imaging Use and Findings in COVID-19: A Single Academic Center Experience in the Epicenter of Disease in the United States http://www.ajnr.org/content/ajnr/41/7/1179.full.pdf
I was fatigued, had unexplainable chest pains some of the time, had problems concentrating, headaches, always a runny nose. I never did a antibody test because I self-isolated for most of the time and never met people without a mask, so I initially thought I was just developing an allergy. Multiple doctors tried to find out what was wrong but all tests where pointing to me being very healthy.
Then I got my second mRNA shot in July and all those symptoms went away, like magic. Very weird for me and maybe I had long covid and what you described happened.
Also it's all a maybe. I don't know if I actually had long covid. It's all speculation on my part by correlating events.
> She almost didn't get her second dose. But she did — and a few days later, she noticed her energy was back, breathing was easier and soon even her problems with smell were resolving.
> About 40% of the 577 long COVID patients contacted by the group Survivor Corps say they felt better after getting vaccinated.
[1] https://www.npr.org/sections/health-shots/2021/03/31/9827994...