A younger nephew of mine found he was exhausted and tired for several months after a normal appendix removal.
You have been through a lot and peritonitis can be life threatening unless treated promptly. Also a temperature of 105.4 deg C must be quite a shock to the body.
In my opinion you are not yet 100% cured and you should go back to your surgeon for further help and advice. He/she has a duty to facilitate your return to perfect health (if possible) and not just to walk away after the physical surgery.