helicobacter pylori infection
"Day 1-Started with first dose after breakfast. Full meal  and 16 ounce glass of water to wash down medicine. Second dose taken six hours later with a full meal at lunch. Also drink 16 ounces of water with medicine. Around 2:30 in the afternoon started to develop a headache. I drink more water to see if that would help. Around 3:30 my headache was much worse and I started developing a stiff neck. Took my third dose at 6 PM  with a full meal and 16 ounces of water. 30 minutes later I got really nauseous and threw up four times. I have never thrown up this much in my life. I contacted the pharmacist and she told me to stop the medication immediately. I also contacted my doctor and she told me to stop, as well."