Feeling feverish, coldness & shivering.

I had fever 101.2F, coldness,bit shivering & bit stomach upset on 05 July 2020 & boil in my arm pit since I had shaved my arm pit 5 days back.  I took crocin & fever went down again had fever on 06 jul 2020 about 100.6 F. I did blood test my CRP level was 16.8. & malaria test was negetive. Doctor prescribed me BLUMOX CA 3 times for five days & UTICEPT once a day for 10 days for urine infection. From 08 July I did not had any fever & CRP level was back to normal. But from that day I am feeling feverish, coldness & bit shivering sometimes during the day mostly when I wake up or even in night time but having no fever. Doctor have prescribed me DEPURA Vitamin D3 oral solution 60000 IU for 8 weeks. Presently having temperature upto 97.9 but feeling feverish & coldness. I have attached blood reports. I had not done Covid test that time since fever had gone in 3 days. What could be the reason for I feeling feverish for 3 weeks now? Any remedy for that? Can dengue or malaria can cause this?