Hello and thank you for posting your medical question on E health Forum.
From the history provided it seems that your pain could be associated with a benign conditions like panic attacks or reflux disorder. These conditions are very common and cause the symptoms that you have described in most teenagers.
In addition being overweight can precipitate the symptoms of reflux disorder.
For the time being , you might consider to use OTC medications like mylanta, maalox to reduce the acidity related symptoms and prilosec to reduce the acid secretions.
You might get evaluated by your treating doctor for a definitive diagnosis. Investigations like a Chest X ray can rule out any lung or musculoskeletal disorders as well.
I hope this helps.