Hello,
Your son’s symptoms are suggestive of hyperphagia(increased hunger) and early satiety(feeling of fullness even before completion of meals).
Causes for such symptoms are gastritis,gastroparesis(delayed gastric emptying,a disorder in which the stomach takes too long to empty its contents),gastric outlet obstruction,heartburns due to acid reflux(GERD),irritable bowel syndrome,diabetes,hyperthyroidism ,cushing’s disease and rarely GI esp stomach tumors.
Try raising the head of his bed about four inches with blocks. It also might help to avoid eating or drinking for two hours before he lies down.Ask him to eat small nutritious meals at frequent intervals instead of a heavy single meal.To help control the stomach acid, one should not drink alcohol or drinks with caffeine in them, or eat chocolate or spicy or greasy foods .
Give him some OTC antacid like Mylanta.He can also take zantac(ranitidine)or prilosec(omeprazole).These will help.Also keep his fluid electrolyte balance optimum by giving him lots of fluids.If still the symptoms persist then pls get the above possibilities investigated by a gastroenterologist.Also get his blood sugar levels and thyroid profile evaluated.
Hope it helps.Take care and pls do keep me posted on how you are doing or if you have any additional queries.
Is it an over-eating disorder, or annorexia?