What Causes Itchiness In Scalp After Taking Macrobid?

Age 35
Height 5'9''
Weight 145lbs
A few months ago I went for allergy testing and my SED blood work came back at 34 which my doc said was high but nothing to worry about. Then about 3 weeks ago I thought I had a UTI and when they ran the dipstick test they found blood and leucocytes in my urine. I was put on Macrobid but it did nothing. Then the tests came back negative for infection. I still had pressure and burning. I recently went to my OBGYN and he took a urine test (which has not come back yet) but since then my scalp has been super itchy all the time. I have been running a low grade fever for a week 99-99.5 and my legs feel week. Can any of this be related? I am so scared right now. I'm going Tuesday for a pelvic ultrasound to see if they can see anything. When I check into symptoms on the internet I am seeing Ovarian Cancer, Lymphoma...etc! I'm freaking out. I am a smoker, not on BC as of about a year ago. I take no other meds. Thank you for your time!