@Melissa89 Thanks for posting your vaccination antibody results. Do you know if your hepatitis A antibodies were considered high as well?
As you may know, there are two types of vaccination:
live attenuated vaccines (where they inject a live but weakened version of the pathogen) and
inactivated vaccines (where the pathogen is killed before injection).
If all these vaccinations you had were from live attenuated viruses, those live viruses may still exist in your body, and assuming that ME/CFS involves some weakened immunity, those viruses may start proliferating, which might be the reason you get an increased antibody response, to try to keep those proliferating viruses in check.
But although the measles, mumps, rubella (MMR) vaccine is based on live attenuated viruses, the hepatitis B vaccine seems to be an inactivated vaccine, as far as I can see from a quick Google search (you might like to check which type of hepatitis B vaccine you received, and confirm whether it was indeed an inactivated vaccine).
So because it is an inactivated vaccine, you would have no live hepatitis B virus in your body from the vaccine (although I guess it's possible you might have picked up the actual real hep B virus). So this does not fit my theory of proliferating viruses.
This is all very interesting, because even when it comes to the regular viruses in ME/CFS (like herpesviruses and enteroviruses), there is some debate about whether the high antibodies levels many ME/CFS patients have to these viruses actually represents an ongoing infection somewhere in the body, or whether the high levels are just a result of some immune malfunction, where the immune system pumps out lots of antibodies, but there is no actual chronic infection.
If you have high levels of antibodies to hepatitis B, but you do not have any live hepatitis B virus in your body, that suggests that the immune malfunction theory of ME/CFS might be right, and your immune system is just producing too many hep B antibodies because of some immune malfunction in ME/CFS.