Fever and chills for almost 25 days. Is.

I have been having for almost 25 days now. When I first went to my GP I was asked to do a urine routine and culture test along with CBC. It turned out that I had severe UTI and was given oral medication. As the medication did not reduce my fever I was given medication through IV 3 times a day for 5 days. The UTI was completely cured after that. But just 2 days after that my fever continued. I also had a Covid and Thyroid test, both turned out to be negative. Now I still feel feverish, get chills, have a heavy head and itchy eyes. However the temperature remains normal whenever I check that is from 96-98. When I go to my GP complaining of fever he says the temperature is normal and I have no fever. So what do I do when I'm still feeling sick but can't figure out what the problem is.