okay so i had a uti at the beginning of this weekend (fri) and its now monday i had to stay home because all weekend ive been vomiting, ive felt dizzy and nauseous, i have lower back pain, a really bad headache and because of the nausea i havent been very hungry. I thought i saw blood in my urine but i cant tell because of the medication my doctor put me on. can someone please tell me whats wrong?