Sinus Tachycardia, Need some Reassurance

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This has been bothering me for three months now. I'm 18, never smoked, taken drugs, or alcohol. I'm inactive, but otherwise healthy. So, one night, my heart began to beat at 130 bpm and I had to go to the toilet many times throughout the night. The next day it was down to 100 bpm and then the day after that to 90 bpm and that's where it has been for the last three months pretty much.

It lasts all day, only when I go to sleep it's 60 bpm, and every test came back good, ECGs, ultra sound, x-ray, blood test... except that on the blood test it showed I had Free T4 of 26 when the range is 11-24, so my cardiologist suggested the heart racing was caused by my hyperthyroid which would also explain why I had to go to the toilet often, as it's increased metabolism.

But I'm an anxiety person so I worry about heart attacks and so on could anyone tell me what they know about this and what my chances are of having a heart attack because of this I'm kinda worried but I guess for no reason?

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