Tummy problems.....anyone?

B
Nauseous: after eating. In the morning. And when I lay flat. Not pregnant. Not related to food, it's ANYTHING I eat. Quite miserable.
Uncomfortable: from my sternum to my belly button. Kind of a 'pressure' feeling. 
Anyone else? Tips? 
Doc prescribed me Zofran to take every four hours as needed.....but I can't do this for the rest of my life! She annoys me. 🙄