Acidity in chest and neck. At night.

Dear Doctor, I went to a doctor on 22nd Feb as I felt dizziness, my body temperature was 94.5 and urine was smelling. I felt bit worried because I am working from home since lockdown and hardly go out. I had gone out on 19th feb in afternoon heat. And this drowsy feeling started next day. DR  gave me uriliser to be taken 10ml 3 times post meal with water and pre biotics. On 23rd night my heart beat increased to 105 and I started breathing heavily and faced difficulty while breathing. 24th morning I went for blood test, sonography and xray prescribed  by doctor and on 25th I came to know vitamin b12, D are very low and high cholesterol. Xray and sonography reports are normal. But since 23rd night my breathing has become difficult and have acidity. My neck chokes and my chest becomes heavy and burning. I am eating normal food since that day. My tongue tip burns and lips become dry as if winter. I am taking macrabonik dsr in morning before breakfast and 1 other open tablet at night.