Hello
You are taking ibuprofen and tylenol frequently for high grade fever ,so these two tablets may be the possibility of pain in the front or abdomen and also intestinal upset ( as you mentioned in the query ).
Fever is high grade and you are also having intense headache and
lightheadedness .
Such type of fever may be due to UTI , but you didn't get urine and
blood test ,so please get in these tests .Also get in
serum creatinine and blood urea with ultrasound of both kidneys .
Since this time , no doubt symptoms don't simulate like UTI but you are an old case of
kidney infection so we should not forget this thing .
2 Flu or
upper respiratory infection may be the other possibility of such symptoms . So consult another physician and get his opinion ( 2nd ) . Since you are taking
cefuroxime and this is not effective because still you are having fever, so 2nd opinion is important.
3 Malaria is another reason of such
high fever . Get in blood for malarial parasite .However , there are so many other reasons of such fever , like dengue , typhoid but physical examination and 2nd opinion is important.
Good luck.