I just Had a Heart attack in August of this year at the young age of 34. How do I deal with all this?

Im 35 now.I just turned 35 in september but in August of this year I had a heart attack. I had 4 blocked autries and so therefor I had to have a bypass done. I cant believe at 34 years of age I had to have open heart surgery. My question is How do I go on knowing that at anytime I could have another heart attack. I came so close to dying that it was unreal. Im suffering from deppresion because of it so I would love to hear from anyone that has some advice.