urinary tract infection
"I took my first pill of macrobid last night and it caused nausea and it made me exhausted. I noticed when I was nauseous, I felt better if I ate something. It's like I constantly needed something in my stomach, but I felt miserable. I also had chills so I'm guessing I had a fever. I'm about to eat a heavy breakfast and take my next pill, hopefully this second dose goes okay. Otherwise my doctor is getting a phone call first thing Monday morning."