[tremon]

Since the liver is the body's primary blood filtration system, pretty much anything that disturbs the normal bodily processes puts a strain on the liver. My mother had a near-zero tolerance for alcohol for almost a decade, while struggling with post-viral CFS in the 90s.

I wouldn't immediately worry about your alcohol tolerance following sickness, but do see a physician if it takes more than a few months (say, 4-6) to return to your previous "default" state.

(and yes, IANAD, IANYD, TINMA and all the usual disclaimers about seeking Internet advice)