Thanks for coming to HCM. You can take any antacid
if you have at home (please check for expiry date). If it's still bed time, you can raise your head end of bed by 6 inches, avoid taking tea/coffee for few hours, take a cup of warm water with 1 tsp apple cider vinegar and 1 tsp honey. You can also eat papaya OR take watery mango/guava juice if you have.
Wish you get better soon!