Hi, I was also very confused by this feeling thinking it was heart palpitations too. After wearing a halter monitor twice a 24 hr and a 7 day with nothing ! My heart rate does drop pretty low and jump pretty high but cardiologist says that’s from being hypothyroidism w/ hasimotos . When I feel this feeling which seems all the time I use my Iwatch ecg so it’s not my heart .
To keep up with this feeling my heart would have to be beating at 200 bpm or more. I’m still thinking the chest pain is a heart spasm . I always tell my Dr that my check engine light is on when he asks how I’m doing !
I also had 2 MRIS ordered from neurologist with normal findings ( cervical and thorax ) hope your Dr can find why this happens to you.