Does anyone have nighttime palpitations during sleep or sudden onset of rapid heart beats? The symptoms are driving me crazy and any advice is greatly appreciated.
I'm 28 years old female. Since young, I have elevated heart rate (normally above 100 bpm, but not too high, during daytime and my heart rate would go up easily with slight exercise, but would gradually go down as night approaches and completely normal during my sleep).
About two years ago, I started to visit cardiologists, went through various heart checks including blood tests, electrocardiograms, echocardiogram, 24-hr Hotler, treadmill test, and one month Holter. Everything showed normal, just showing I have elevated heart rates at random times. So my cardiologist diagnosed me as Inappropriate Sinus Tachycardia (IST) and I started taking low dosage beta blockers to control my heart rate.
In the first year after I start taking beta blocker, I felt great. However, after the first year, I started to have sudden onset of tachycardia that happens at random times, with a lot of them happen during nighttime when I'm sleeping. I would suddenly wake up from my sleep finding my heart pounding, mostly around 120 bpm - 130 bpm, but sometimes would go up to 140 bpm to 160 bpm. It also accompanies with icy and wet hands and feet, sometimes dizziness, numb hands, weakness, nausea, and spasms. It normally lasts about 3-5 minutes and my heart rate then gradually goes down (occasionally I would have 2nd onset after about 10-20 minutes of returning to normal heart rates). The Holter captured it few times and showing as sinus rhyme.
When it happens during my sleep, it really disrupts my sleep as I find myself hard to fall back to sleep again. I've talked to my cardiologist about this and I experimented different beta blockers but none works well. I'm currently taking Bisoprolol 2.5mg daily.
Does anyone have similar issues, know a way to fix it, or know how to cope with it? Any advice is deeply appreciated!!
Progress post surgery 
ICD or not ICD
Sorry to be leaving.
