Pressure Under Ribcage

Before any treatment plan can be suggested, an accurate diagnosis must first be attained.

An abdominal ultrasound and chest X-ray may be indicated here.   You don't mention if it is your right or left side.  An endoscopy is another idea.

As well, blood work should be done, including a CBC, Ferritin, liver enzymes and general chemistry.

Your symptoms, for example, could be something as simple as a deficiency in digestive enzymes or food allergies.  Your symptoms could be something more complex like a haital hernia or gall bladder disease. Or, your symptoms may indicate something more serious, and a colonoscopy is one of many tests to help determine or rule out a particular diagnosis.

Accurate diagnosis is the key to good effective treatment planning and health attainment.