diarrea symptons for last 2 weeks. nausea, but not getting sick. have been feeling tired as well. diarrea earlier was yellow and liquidy, also burnt. Started about the time i started taking Vitamin C tablet (500)mg. I was also taking a normal multivitamin and Prilosec OTC for heartburn. I have stopped the Vitamins, but still take the Prilosec otc for i have really bad heartburn. i take one every other day. Have been for about 2-3 years without diarrea symptons. My dad and grandpa both have acid reflux and I clearly do as well, although have not be diagnosed. My concern is the diarrea sympoms. Its has been off and on the diarrea passing 2 weeks now. i have fealt mostly fine other then the diarrea symptoms and the nausea which isn t real bad. I m 23 years old.