Talk to Gastroenterologist on Stomach Pain

I have been feeling this pain for quite some days. Whenever i eat something i feel a little pain and discomfort in my stomach. And i feel like i am full having no appetite although i do not eat much. This uneasiness is always followed by eating anything. Also i am not taking spicy foor or fast food. What is the possible reason for this? Or how can i overcome this discomfort? Plus i feel a bit swelling on my stomach area. Could it be related to gallbladder?