welcome to HealthcareMagic
The over dose of drugs is i guess self drugging to get a high so please tell him not to do such things again or he may land up in trouble.Aspirin
causes severe acidity and can cause bleeding from stomach and exedrines containing i guess ephidrine can cause high BP
so the combination is potentially dangerous.As for comfort from pain in abdomen you can give him cold
milk and he should feel better also get him to a doctor to get examined and he will prescribe some antacid
to get relief.