Shortness of breath with cpap

I am using cpap since last 8 months…however accassionlly, during sleep with cpap …I get breathless, I takeout the mask, getup and start walking to gasp my breath. At the same time my heart starts beating very fast and I feel chest pain, and it lasts for several minutes…

Also, some times, while sleeping with cpap, I feel discomfort in left side of the chest and I feel better if I take turns, or getup and sit or start walking…?

Why do I feel like this even after using the cpap machine…or is this normal…?

No. That is not normal. Please call your doctor.

What could be the reason for this…any doctor or any expert in this forum
can provide more information on this…please…?