Experience tight band like feeling around chest, tachycardia/forceful heart beat, weak ... after eating. lasts a while. what can cause this?

Chest pain after eat: If the symptoms occur only after eating - makes me think less of a cardiac cause. Sounds more like a hiatal hernia or GE reflux. A hiatal hernia may press on the nerves around the heart causing your symptoms. I might suggest that you see your family doctor - get an EKG to exclude ongoing heart ischemia and consider an UGI x-ray or a barium swallow x-ray. Good luck.

EKG ,echocardiogram: See your doctor to have evaluation ,EKG and echo cardiogram to be sure your heart condition is OK.