I'm a moderator at one forum and a site guide for another, and there is always understanding when we're unable to carry out our duties for a time because of illness, putting in a lot of work hours, personal concerns etc. I'm sure the powers that be here @ PC would be even more understanding; after all, we're ALL mentally interesting!

I vote for staying on and doing what you can. Someday you'll be the one who's in good shape while a fellow community liaison is struggling, and you'll make up for lost time.