Fevers post-Whipple

I had a successful Whipple done in September 2023 and had minimal after-effects (except a hernia that required abdominal wall reconstruction). I am quite lucky and pleased.

However, since then I have had 11 short bouts of fever/chills/rigors/exhaustion that lasted between six and 36 hours. Several trips to urgent care and two emergency room visits have resulted in no diagnosis. (I now just wait out the episodes.) I do not know if these are after effects of the Whipple or chemo or something else entirely. I have an infectious disease consult at Mayo Rochester when I have my next scans in June. But, I'm curious: has anyone else experienced this phenomenon.