Why im sick

 abdominal pain and burning, full even before eating, bloating, slight fever/i get hot easily, nausea, burping, vomiting occasionally, sour stomach, empty feeling. 

When it happens, it starts in the center and radiates upward to shoulders/neck. It hurts to the point it makes me bow over. I get hot all over, especially my face and I have to use a rag to cool down or sit in a fan. If I take OTC Antacids, it helps briefly but usually it's a process; it starts out calm, then the pain worsens until I get nauseated and if I don't brace myself or calm myself, I will vomit. 

I do feel like I suffer from anxiety, which might make all of this worse because I overthink and overreact.