What are my stomach pain & cramps and fullness when I swallow symptoms of?

Depends. Depending on how long after you eat, what types of foods cause problems, and where you have pain all play a role in diagnosing the cause of these problems. I would start with seeing your primary care doctor, who may recommend a gallbladder ultrasound to look for gallstones, or a referral to a gastroenterologist or surgeon. Good luck!