What Causes Low Grade Fever,body Aches,fever And Lack Of Appetite After Appendectomy?

I am 32 year old female, 7 weeks post open appendectomy. My appendix was perforated and gangenous and I had mild peritonitis treated with IV antibiotics in the hospital. Since my surgery I have had a low-grade fever that has recurred 3x. Most recently, my temp vascillates between 96.2 and 100.4 throughout the day for the past 4 days. My urine and blood tests were mostly normal (slightly elevated WBC). I also have extreme fatigue, body aches that come and go with the fever, lack of appetite, and some abdominial bloating. My main concerns are blood infection or recurrence of peritonitis. But I would think I would be much much sicker constantly if that were the case. Seeing my PCP again this week, possibly for CT and blood culture. Any other suggestions?