Low grade fever after exertion. Hel!

Sir i was having fever 99.5 to 100.8, chills,shivering during month april 2019 i discussed with urologist they told me it may be uti so they gave me ceftroxime 200 twice a day for 6 day but my condition wasn't improving so my dad friend advice for widal test it was positive 320 type o so i took oflox 200 for 11 days with dolo 650 i donot got fever as normally and took multivitamins to get the strength back but still august i donot got my strength as normal so i took vitamin b12 and d25 test they were 242 and 20 respectively normal range is 30-70 but my diet is full of vegetable and i took enough sleep and sunlight but still my legs always feel weaken i m exhausted even after taking a 10 hour long nap i just check that when i roam or do some activity i got fever of 99.0 to 100.1 (without chills and shiver )depend on how much time i spend on activity . I m very much fed up with life please help i have same like cases seen on net and 1 in real life but they are still suffering please hel