I was having really bad heartburn for about a week. I had never had heartburn before. I thought it was something with my heart, so I went to the ER. They did an EKG and blood work and told me it was GERD. They gave me a prescription for nexium. I have been taking it for about a month and a half now. The heartburn is completely gone but I still have random little pains in my chest and a lump sensation in my throat sometimes. The anxiety of what could be wrong with me is driving me crazy. Normally I am not an anxious person, but every little twinge I feel I freak out. I also just have a feeling of being generally unwell. I have cut out all caffeine, soda, and have been eating healthier and not eating at least 3 hours before bed since diagnosed with the gerd. I have lost 21 pounds so far. The last few days i have noticed that my stool has been a dark brown/green color, but with really light colors mixed in. I feel like I m going crazy, because I don t feel normal.