Awaken by a jolt in the chest right before falling a sleep. And felt like ran out of breath during falling a sleep or simply like forgot to breath for a second or two. It had happened three time within this week. I'm just too terrified that I might not wake up the next day.

I'm 30 YO male, 5.5".
I used to be 150lb with BP 140s/90s
with 96 -100s bpm resting heart rate.
And last month I had a hard time breathing and went to see a doctor. He suggested me to eat healthier diet and loose a couple pounds. And on my own initiative, I also stay away from salt and sugar as well.

And now I'm 143lb
BP 113/67 heart rate 78bpm and having a problem with falling a sleep like I mentioned above.
Is there anything wrong with my body?
Is it life threatening ?