Your history suggests that you may have periods of abnormal rapid heart rhythm ...SVT may cause bursts of rapid heartbeat such as baseline 75 and suddenly doubles to 150... Such rhythm may at times be debrief for seconds or minutes but may be lasting in many cases
Another culprit could be atrial fibrillation with rapid ventricular response ... This would be more likely to occur when you lie down because this position increases the volume and pressures within the upper chambers of the heart ...
Follow up with your doctor
It sounds that you need a 24 hour HOLTER monitor to be set up to determine what is going on with you
This is an outpatient procedure that requires you to hook up a small portable monitor that follows your heart rhythm..
This test should be able to diagnose the source of what you feel
Treatment from that point depending on the source of the symptoms
I hope that this information is helpful for you
Let me know if you have further questions or concerns
I will be happy to get back with you
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Thank you and Best Regards,
Anthony Bray MD