Recently, I developed some significant sinus tachycardia on a work trip that has increased in frequency ever since. My heart will randomly jump to 100-160bpm with little to no effort, but it is in normal rhythm and comes back down after a little bit. My doctors explained sinus tachycardia is a symptom, not a diagnosis. I've been going to every specialist I can get my hands on and so far no one has any answers as to what could be causing this.....except that it is possibly anxiety/panic attacks. I've had anxiety historically speaking, but it absolutely did not present like this. I used to just have easy crying/burst of emotion, uncomfortable feeling in my chest (that tightness we all know), and the feeling of not being able to get comfortable because things touching me felt awful. But that anxiety was never debilitating. It was inconvenient, sure, but never so bad that I couldn't function in my every day life. This new - whatever it is - is completely debilitating. It is a chicken and egg situation because I don't know which came first (though my gut tells me it was my heart that came first and is causing the anxiety).

Has anyone else had a similar issue? Was it truly anxiety or was there an underlying medical cause? The doctor said whatever is causing the sinus tachycardia is not originating from my heart....so where is it coming from? How do you cope? Breathing exercises and attempts to ground or focus myself don't always help. I'm now entering an intensive outpatient mental health program because of the toll this has all taken on me. I've also developed medical anxiety because I'm always afraid they're missing something or that medication is going to make me worse. I want to get back to a place of positive thinking and normal functioning. 

Thank you ahead of time to anyone who offers kind words. I feel blessed to have found this outlet. God bless you.