hello.after reading your history,let me tell you,you have nothing serious to worry about . first of all,your heartburn could be triggered by stress,improper food habits or food timing ,other diseases of the digestive tract. putting together,your symptoms of heartburn and the body itching,i would make a likely diagnosis of an active helicobacter pylori infection in the stomach causing a similar combination of symptoms. i would recommend you to take esomeprazole twice daily for 10 days before food ,drink plenty of water,follow a active lifestyle ,try medication for relieving stress and have food at regular intervals. for confirming a h.pylori infection,you will have to do a blood test,stool test and a breath test and may be an endoscopy in suspicious cases. i would also recommend, a regimen of antibiotics against h.pylori,including metronidazole and amoxicillin to be taken orally for 10- 14 days along with esomeprazole.And most likely your shoulder pain is due to referred pain arising from the stomach infection,which should clear up and also you could apply warm cloth over the area on the shoulder with analgesic gel application like diclofenac gel Hope i have cleared your doubts,please follow up if you have any doubts and have a good day