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I understand your concern.
Well as you describe you can try some self care measures which provide him relief.
Give him a liquid diet.
Also hydrate him with Oral rehydration solution.
Give him OTC Prilosec and metamucil.
Give him Motrin.
Apply warm compresses with a heating pad.
Avoid spicy,fried food,carbonated beverages.
He can do saline gargles and steam inhalation for cough.
A probiotic can be helpful.
If his pain 'll not improve with such self care measures then visit ER again and ultrasound whole abdomen can be advised.
Hope this helps.Use reply to let me know if you have further queries.Please to not forget a positive rating.