"I am taking Nexium for acid reflux. Before, I was taking Pantoloc. Is it possible that my new medication is causing me to experience loss of appetite, feeling of a constantly full stomach, and always feeling tired?"

Yes, it is possible that the new medication you are taking could cause loss of appetite, feeling of a constantly full stomach, and fatigue. It may be helpful to try other medications such as Dexilant or ranitidine if your symptoms are not fully resolved with your current medication. These alternatives could potentially provide relief from your symptoms.