Waveform/baseline help

Waveform/baseline help

Hello wondering if anyone could tell me why my heart rate is like this, I'm still under cardiology and I now have a 7 day ecg and a handheld omron macheine when my heart rate does 'deviate' or how ever you would describe it is accompanied with chest pain. (The straight line does contribute for a while can't fit the whole thing on so took a picture of the rythem just before it goes straight) 

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