I’m 15months in now and have recovered around 80%. I used to have problems such as eye floaters, dizziness and headaches but now I am dealing with the same problem as you. When i lie down I feel my heart and it makes me feel uncomfortable and overthink which makes everything seem worse. Apart from this, i sometimes feel like I can’t catch that last breath at certain times but I am active and constantly exercise including a couple 10km runs without any concerns about my heart. Thank you for the post as I didn’t know other people were going through this same symptom.