I'm diagnosed with M.E. & FM amongst other things & have had this surgery a few times now - sorry I'm wiped out & sneezing right now so can only be brief?
Yes - it can be the source of the other infections
Yes you will feel better afterwards - it will affect your health in lots of ways
so all round its important to get it done
recovery for me wasn't half as bad as expected, not really much worse than when I had earlier surgery, when I didn't have FM etc - officially its 2-3 week recovery, but you can manage fine after a day or so at worse, though obviously work needs to wait & rest as much as possible - I was up on my feet & feeling the benefot the same day, which really shocked me, they even made noises about maybe keeping me in a few days - no need :)
Do prepare yourself though, I took high dose of Spirulina in the weeks running up to surgery & ate well, took magnesium & b vits e etc etc - I'm certain this all helped
if you get DLA, I believe you can qualify for back up with your son, nanny etc - or maybe speak with your family info service, they might help with that or know of respite care - sorry I can't help much on that bit as my DH helped with DD
HTH a bit
good luck & remember you need to look after yourself first in order to be well enough to look after your DS