bladder infection
"I used to have recurrent UTIs, and had no problems with other antibiotics. I hadn't had one in around 6 months, but am in week 7 of my second pregnancy and they've returned. I was given nitrofurantoin, 50mg 4 times per day. 
The first and second dose made me incredibly nauseous all day, delirious and with a fever but freezing hands and feet. The 3rd and 4th mild nausea. I'm on day 2 and there are still mild cystitis symptoms, and again the 1st dose in the morning made me nauseous and delirious. 
I'm too sick to leave the house to change my medication and have had to miss work, but I will definitely be asking for something else if ever prescribed this again."