Anxiety, fear of heart attack, thoughts.

Hello,since few time I'm facing issues of anxiety like racing thoughts, sometimes i feel that I am disbalanced while walking or like I am sinking under the ground, heart beat increases and fear of heart attack, and sometimes burning sensation in left side of chest under collarbone or towards shoulder also sometimes. I can't sleep properly on time even if I want to as my mind always keeps thinking and thoughts don't stop. I did blood test in which haemoglobin was excellent according to doctor. Due to this I fear to go out with my friends also for a long distance that if something happens then what will I do etc. Etc. Everything happens to me on a random basis like anytime even sometimes in the morning when I get up from bed. And it comes and goes but makes me anxious. All this started after Covid-19 even though I was not infected with covid previously. But I had worked in Mumbai in the covid period and saw the situation very closely. I was very active back then now I am not due to this.