My wife had something similar recently
Supraventricular tachycardia I believe it was
Checked HR with a monitor it was approx 180 When ambulance arrived and hooked her up to their machines it was 213 bpm !!
Blue light to hospital and the thing that brought her HR down was blowing hard into a 50ml syringe, (3rd attempt) which apparently puts pressure on the lungs and in turn ‘resets’ the heart.... if that didn’t work .....it was ‘switch off and on again’ by momentarily stopping her heart !!
She had blood, ECG, urine etc tests and all seemed within correct ranges apart from BPM, tho this seems to be normal once again ??
She now has appointments with doc and cardiologist at hospital as all other signs were relatively normal .... so maybe further tests ???
She had something similar about 15 years ago but no where near as high or as long (2-3 minutes of fast heart rate)
Life is too short .... Carpe Diem !!