Feeling heart palpitations with fainting

Hello, I am male 27 years old. I got sick sinch March. I was feelings acidity and heart burn. I consulted to my doctor and treated for acidity and stomach ulcer on the basis of endoscopic results. I had my chest x ray and ecg. Both were normal. But my problem was not resolved. Then I showed to other doctor, he told me that I have anxiety. So I took medicine for anxiety for 1 month. But still the problem was not resolved. So I ordered a full body checkup test and got that I have deficiency of Vitamin D .Now I am taking medicines for vitamin D3 and calcium. But the heart palpitation (racing too fast which I can feel in my neck and Thorat) and fatigue is also there. Sometimes I think that I should check for corona virus but my doctor did not recommended me to have a test. from the past few days I am having symptoms of heart palpitations, mild chest pain(occassionally from last 3 months), fainting and fatigue. It is because of vitamin D deficiency or something else. Help me out. Thanks in