Strange thng happened. sever joints pain

Had severe headache and severe neck pain and wrist pain along with lower back pain and upper hips pain(both) from 2 months... as i use to put my hand up my ring finger and small finger used to go numb.. Though the pain used to be lessened as i start working.But no fever was there. I went to ortho and pysio both, they told me to get done following tests: Rf, Cbc, Esr, Uric acid, Anti ccp, tsh, vit d deficiency test,Cervical xray, Brain mri, vit b12 defi test. all came as normal except vitd it was litle less only.i took supplements full course but nothing changed , No changes. I started livind with the pain as after sometime After 1 month again i started feeling pain in every joint..i again went to doctors with all tests reports i had.they all said i had fibromyalgia confirmed.but i didnt took medicines.after 15 days i got fever kind (with normal body temp) of thing.. the doctor gave me fever course . Antibio, Parct for 6 days.. now i am comp alright.. no pain anywhere frm 1 month.. how?