http://www.rxlist.com/cgi/generic/penvk_ad.htm

Some info here, hopefully other folks can chime in with their knowledge and experience also.

Is it possible that the infection itself is causing the fatigue? Also, I've experienced fatigue after a stress passes, once I make it to the appointment etc., I'm ready to collapse after.

Can you call and check with any health care folks on this? With it being an unusual level of fatigue for you, worth talking with a nurse.

Good luck and fast healing to you,
Sarah