I keep feeling this weird vibrating or quivering in my chest but when I take my pulse or feel my neck my heartbeat feels regular and normal

got so scared I went up to a&e and they did an ecg and said it looked fine but not sure if I was getting the vibrating feeling during

im not sure if it’s just the vibration feeling of my pulse because my pulse is always very strong and my blood pressure is a bit high which makes my pulse very strong in my neck and chest and Sometimes my clothing and bed shakes with it

or not sure if it’s just slight rumbles in my upper stomach since it’s a bit irritated atm from gerd

I keep panicking and wondering it it’s VT or fibrillation or something