Gastritis?

Since September 2022 I haven't had any illnesses except for 3 days of coughing in January and occasionally slight symptoms such as a cold for a day or some slight pain. For more than a week now I have had slight abdominal pain with certain movements and my stomach then feels a little heavy. I researched something on the internet: it could be gastritis. I only ate a green smoothie today and am beginning to fast or eat very little.

P.S. A few days later it felt more like a problem with the liver, a squeeze right below the ribs. During august the symptom disappeared.