Answer:
I would suspect Heart Attack, but hiatal hernia- a condition in which the upper part of your stomach bulges through an opening in your diaphragm.
Explanation:
The symptoms sound like those of heartburn, but seeing that antacids didn't have any effect. Antacids neutralize (reduce) excess stomach acid to relieve heartburn, sour stomach, acid indigestion, and stomach upset. They can also be used to relieve the pain of stomach and duodenal ulcers.
https://my.clevelandclinic.org/health/treatments/9624-heartburn-treatment
Shortness of breath, epigastric pressure are one of the four silent signs of a heart attack. You usually have to look past chest pain, to give a resolute diagnosis. They often suffer from subtle symptoms such as:
Pain in the arms, neck or jaw
Sweating or “cold sweat”
Unusual fatigue
Feelings of fullness, indigestion or choking (also symptoms of heartburn)
Nausea or vomiting
Lightheadedness, dizziness, extreme weakness or anxiety
Symptoms of a hiatal hernia
It’s rare for even fixed hiatal hernias to cause symptoms. If you do experience any symptoms, they’re usually caused by stomach acid, bile, or air entering your esophagus. Common symptoms include:
shortness of breath
heartburn that gets worse when you lean over or lie down
chest pain or epigastric pain
trouble swallowing
belching
I know this is long, but i hope it helps lol . ^-^
