What you are experiencing now is not from the Bactrim.
Even delayed allergic reactions occur in several days rather than several weeks.
I think you should have your urine tested to make sure you aren't developing a kidney infection.
Could the kidney infection be relative to the sulfa allergy? my wife says my eyes have been somewhat red, too.
what I was concerned about is incomplete treatment of the urinary infection due to the allergic reaction..meaning you still had a UTI because you couldn't take the bactrim long enough.
Another thing to consider as a possibility is that of shingles, which some times pops up with an antibiotic...if that's the case usually there is a painful area followed by a rash.
I'm happy to answer follow up questions as needed, but remember to click 'accept'.thank you so much.Dr. Pfeiffer