urinary tract infection
"I was giving this medication for a UTI. By day 2, I honestly thought I was dying. I had severe back pain and headache, both unrelieved by Excedrin which usually works great. I felt spaced out and unable to concentrate...achy all over like I had the flu.  Last night my heart started racing and my chest felt so tight, I felt l was going into anaphylaxis. I have never had an allergic reaction to a medication, so no sure if these symptoms are side effects or allergic reaction, but $30 worth of medication went in the trash because it isn't worth the risk. I have a call into my doctor who will hopefully call in something different."