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> do you ever get that feel like you are going to die soon?
Not too long time ago I had similar feeling, but I cut off energy drinks and after some time heart went back to normal. I'm also trying to self improve which include better diet. Lacking of certain elements in your food might be your problem. If this problem persists especially in winter you might need to supplement yourself with vitamin D.
Try to get proper sleep if you don't do it already. 7-9 hours should be enough. Don't stay up late at night, try to go to sleep and wake up at the same time.
Cut off masturbation entirely. If you feel depressed about it now it's not going to get any better in the future. I felt the same as you and once I started to restrain myself I've noticed I feel better in general.
Doing exercises or getting some move in general is also a great idea. Unless you're construction worker or something, then it won't probably be necessary.
Entertainment is important, just be sure you're not doing something harmful and not too much so that other aspects of your life don't get neglected. Personally I mostly play computer games, read, go for a walk, watch a film. Nothing unusual I think.
How old are you btw?