bladder infection
"I was prescribed 6 pills for a bladder infection I got after a surgery.  I took the first dose, 1 pill, on Friday evening. Everything seemed fine until Saturday afternoon. By this time I had taken 2 pills. A severe headache settled in so I took some Tylenol. I started to noticed I was getting really gassy.  The medicine also started working at this point. It was no longer painful urinating the entire time but rather only as the bladder became empty. Took my 3rd pill and went to bed. Woke up around 4am feeling like I had the flu. Skin was hot, body aches, and I had chills. Headache was also back ten fold. Now the gas has turned into painful gas cramps. I won't be taking more until I talk to my doc Monday morning."