Palpitation while lying. Diziness!

Hello Doctor, I am having upper back pain for the last 4 months consulted ortho doctor they advised it is because of postural problem and muscle tightness, going for physio, while doing it I feel relaxed but after that slowly pain is coming back. while lying down relaxed like chest wide open getting feel of chest tightness and palpitations. Consulted cardiologist he asked to take some test to rule out cardio issues I have done ecg, echo and tmt, chest x ray all comes out normal. BP and Cholesterol wer there. Taking BP pills metosartan 25. Even after that test which I have done 3 weeks back I am getting chest tightness, dizziness sometime with heart palpitations while lying. When getting such feel I become tensed and worried. Kindly suggest what to be done further to come out from this issue. Is this post covid long term symptoms mentioned by WHO. Fatigue Shortness of breath Cough Joint pain Chest pain Muscle pain or headache Fast or pounding heartbeat Depression Anxiety Dizziness