Hello
I understand your concern.
Fever ,chills,fatigue can be due to common flu but if it is viral flu it will resolve itself by 3-4 days.
As you are exposed to cold environment and are on outdoor,it may be due to upper
respiratory tract infection with secondary bacterial infection if it lasts beyond 3 days.
Fatigue in general may be giving you pain at hip where implant was put.Other possibility is
bacteremia causing implant to get seeded from an infectious source in body.
It definitely needs antibiotics course.
URTI bacterial infections can be managed through a course of erythromycin/doxycycline for 7-10 days.(prescription drug)
Take
antipyretic analgesic combination like
paracetamol acetaminophen/aclofenac thrice a day for fever.
Take plenty of fluids to maintain hydration.
Persistence of symptoms may demand consultation of physician and
blood culture.
Hope this information helps.
Wish you good health.