I have it for years but last few years it's almost every night sometimes I don't have them for a week and then have them again. But those attacks are strange. I have them just in the first minutes of my sleep. Then I wake up and jump from my bed with terror feeling high heart rate and I feel that I can't breath sometimes I can talk or scream liks "I am dying help me!". I don't have sleep apnea I did sleep study but they didn't catch those episodes but doctor told me if you have sleep apnea then you have it every night and not just in the first minutes. Because I have those episodes only in the first minutes of my sleep and then I can have few in a row. Falling asleep and bam panic then falling asleep and again sometimes it takes me hour or two to fall asleep. I had once 6 times before I fell asleep. I never had them in the middle of the night. I tried to sleep with oxymeter when I wake up from panic the my oxygen is 99 and pulse 100. So I don't stop breathing. 
My GP can't do much she told me take Diazepam I have tried and it helped but sadly you can't take because it will cause addiction and tolerance. 
I am afraid that I can die because sometime I feel pain in my chest not real pain more like pressure or crush for minute maybe. Very annoying 😔