I get heaviness in chest while lying down and also feel some pressure there. When walking and exercise no chest pain and nothing . And also I feel like nipple blocked feel. And I has chest pain in middle from almost 2, months which comes and goes. I did two ecgs one with 115 BPM (sinus tachycardia) doctor said normal and another after month 77 BPM . Though now chest pain is less but it comes sometimes. Chest pain started after taking vaccine 2nd dose 12 days . And also I habe heard about myocarditis can it be it ???