Low grade fever lasting 5 months

Please, any advice and help is so appreciated. 24 yo male. It all started with c difficile infection (or at least that's when I noticed the fevers), on my 2nd dose of vankomycin. Since I've had antibiotics 3 more times. Currently I'm toxin negative, my calprotectin is less than 20. Stools are not good but once per day. I lost around 10kg in these 5 months. They also found Proteus Mirabilis in my semen. I stopped being weak and feeling ill, however, every afternoon I get a fever that goes up to 37.5c (99.5f). When it happens my feet and hands get cold. Often I get shiverish and feel like my immune system is activated, later I get hot and sweaty, especially at night. I'm really scared. I also have limb and joint pain, mainly hands and legs. I don't know who to turn to, doctor seems not to know what could be the issue. Any advice or help is much appreciated.