pain in the left side of my chest and arm, palpatations....

Welcome to e health forum.

At your age, of 20 years, it is unlikely that you will have major medical disorders. Since you had a recent medical examination, it is certain that you are normal.

But it is possible that your symptoms are due to gastritis or gastric reflux.

Gastritis pain occurs in the left upper portion of the abdomen and in the back. The pain seems to travel from the belly to the back. Other symptoms of gastritis include - Belching, Nausea and vomiting, Bloating, Feeling of fullness or burning in the upper part of the belly.

For the time being, you may need to avoid foods that are spicy and with high fat content. Avoid foods like - puddings, breads, bagels and pretzels are usually made with white flour and refined sugar ; vegetables such as broccoli, cabbage, all kinds of beans and legumes, full fat milk, onions and green peas should be avoided. Cured meats and high fat meat products such as sausages, salami, ham, bacon, and Red meats like beef and lamb should be reduced in consumption or avoided totally.

Treatment of your symptoms due to acid reflux or gastritis can be tried with over the counter antacids like Gelusil, tums, mylanta and acid reducing medications like omeprazole.

If they do not help, then, stronger medications that protect the stomach's lining or lessen acid production in the stomach are available by prescription from a gastroenterologist.