Sharp stabbing chestpain on hiccup, cough. somewhat body postional but cause inconsistent. eating might provoke. bowel movement makes it easier?

Sharp chest pain: You are describing esophageal spasm and acid reflux. Try this - smaller bites, chew very thoroughly, sip fluid between bites, take a few seconds between each bite, smaller meals, smaller portions, softer foods. If no contraindication, try omeprazole 20 mg OTC, twice a day for 2 weeks, then once a day for 10 weeks straight. If you are heavy, aim to lose some weight.

Chest pain on cough: May be musculoskeletal, gas or colonic from constipation or other process since provoked by eating an relieved by bowel movement. You could try simethicone but follow up with GI and consider colonoscopy/CT abdomen/pelvis to insure not missing lesion, polyp, tumor, diverticula or rare hernia..