ventricular aneurysm

I have a ventricular aneurysm. EF 48%. So I sometimes wake up in the middle of the night gasping for air. I feel like my heart has stopped, I feel a warm sensation in my chest, I can't breathe, I begin to lose consciousness, then I feel a sudden release and my heart beats fast for awhile and I have a huge hangover-like headache for awhile after. And I certainly can't go back to sleep. This has happened a few times during the day too. What kind of arrythmia is this? Is it life-threatening? What is the treatment? Thank you!