 [ Symptoms ] i had surgery very high fever – rushed back to hospital feel like i am being poisoned [ Disease ] i do not think your back surgery is related to current symptoms except for your immunity has dropped down dramatically after it… i think the symptoms you are cimplaining is related to immunity weakness and low white blood cells also you may be having a chronic gastric disorder that might be ibs … i recommend doing a cbc and abdominal usg a gi specialist then can follow