I was diagnosed with GERD about fifteen years ago. My doctor at the time prescribed Zantac 150 mg twice a day. She advised that I would have to take it for the rest of my life. Needless to say I have been obedient since. Over the years I have had some serious panic attacks (fear of food allergies, irregular breathing, etc), some causing me to go to the emergency room. About ten years ago I started having SVT ( heart rate jumping to 225 for no reason). I would have it twice a year until I decided to have a corrective surgery two weeks ago. Since the surgery (which the anesthesia gave me horrible reflux) I have had major panic attacks (thinking the surgery went wrong, allergic reactions to foods I have always eaten, etc) and have again, visited the emergency room. Of course, I was always diagnosed with having another panic attack. About an hour ago, after I had taken my Zantac and eaten dinner, I had a huge panic attack. I was preparing to go once again to the emergency room while trying to convince myself that it was just another panic attack. I hadn't done anything differently or eaten anything differently so I calmed myself enough to go online and do some research. Would you believe that Zantac, my trusted medicine for over fifteen years, can have side effects such as ANXIETY, IRREGULAR HEARTBEATS, CONFUSION, DEPRESSION, HALLUCINATIONS, AND SEVERE MENTAL ILLNESS?! Looking back, including tonight, I realize that almost everytime I have had a panic attack its usually about 20-30 minutes after taking my Zantac! OMG! Has anybody every experienced anything similar to this? Have you ever even heard of this? I AM COMPLETELY SHOCKED! I have seen several doctors and noone could share this bit of information with me?! Whats the deal? What do I do now?