I have had GERD symptoms for 10 months. Over that time I have lost 25 pounds and cannot gain weight. Is my weight loss common for a 64 y/o male? My doctor prescribed lansoprazole 15mg but the med doesn't help much. Higher dosages cause diarrhea. I have GERD symptoms ranging from mild discomfort to severe pain almost daily, particularly late evening. I have modified my diet and do not eat after 6 pm. I need to re-gain weight I have lost.