Hi
Welcome to HCM ,
first thing is your father has to continue above medicine and it should not be stopped ,
regarding present problem adopt healthy food habit ,
few tips are ,
eat small amount with more frequent times ,
avoid fatty ,fried food ,
avoid talking whle taking food ,
take less amount of pulses ,
take more blend diet ,
avoid refined sugar diet ,
do not sleep immediately after food ,
avoid spicy food , avoid carbonated drink ,
change time of
aspirin from afternoon to night ,
say big NO to any addiction ,
take proper sleep ,,and rest ,
if symptoms persist consult family physician and follow his advice
take care