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Fast resting heart rate above 100

I am a male 37 year old with IBS. 2 months ago I had this episode of fast heart rate that then lead to shortness of breath and I felt I am going to pass out. So I went to emergency room.

They did ekg of heart and CT scan of lungs along with blood tests. They all came back normal. Then they sent me to heart specialist. I did stress echo test which was normal. Also had zio patch for 2 weeks. They said that was also normal.

In the mean time I followed low fodmap diet and I felt a lot better. Almost no heart palpitation until couple of days ago. I had another episode. My resting heart rate went up to 135! 2 days gone and I am still having problems. If I eat, I get shortness of breath for 3-4 hours. If I don't eat I get heart Palpitations for a few hours.

Last time doctor said it might be panic attack related and wanted to put me on Xanax but I refused. I honestly don't have any mental problems. Also food allergy specialist told me these symptoms are not allergy related. I have also done some asthma testing and thyroid and other blood test all came back negative. I am completely baffled.

Could it be STD related? I have had bad luck with STD before. Although I recently tested and it's all negative but it could be dormant in me? Please if anybody can help. This is making my life miserable...
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20748650 tn?1521032211
Did you have an episode on the ZIO?

As always there's alot of things this could be and speculating is kind of pointless. STD related? It would be odd to have a normal set of bloodwork with an STD.

Anxiety is possible of course.  If you did not have an episode while on the Zio the next step would be an implanted loop recorder.

They may want you to try the Xanax though before going that route. No shame in trying it. It can be very addictive though so that would be a viable reason to not want to take it more than anything.
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