There isn't sufficient details to reach a specific diagnosis. But from your symptoms it seems multi factorial as your symptoms are suggestive of gastritis and vertigo. I would advise you to visit a MD general medicine so that you can be examined and undergo necessary investigations such as ECG, CBC, thyroid profile, etc. to find the underlying cause of the problem and have it treated accordingly. If the problem persists or worsens visit the ER at the earliest.

Anxiety can cause Sinus tachycardia which is a normal increase in the heart rate. The heart rate is fast, but the heart beats properly. Causes of sinus tachycardia - A rapid heartbeat may be your body's response to common conditions such as: Fever Anxiety Some medicinal and street drugs Severe emotional distress Fright Strenuous exercise Other causes but less commonly, it may indicate: Anemia (low blood count) Increased thyroid activity Heart muscle damage from heart attack or heart failure Hemorrhage (severe bleeding) You may be having Palpitations, which are feelings or sensations that your heart is pounding or racing. They can be felt in your chest, throat, or neck. You may Have an unpleasant awareness of your own heartbeat or may Feel like your heart skipped or stopped beats The heart's rhythm may be normal or abnormal when you have palpitations. Palpitations are not serious most of the time. Sensations representing an abnormal heart rhythm (arrhythmia) may be more serious. You need a routine health check up done with ecg, echocardiography tsh, CBC. Just to rule out causes other than anxiety.