I'd like to hear some ideas from you guys. What should mix with my coffee so i die faster?

I'm not interested living this live. I wanted to end myself recently. I wouldn't hesitate to gulp sleeping pill that will put me in eternal slumber. But here i am.

So i decided to drink a lot of coffee (probably got addicted), approximately 3-5 cups per day. You'd be right, if you thought it's not too much. A little while ago my heart started behave itself not quite well. Heart accelerates and slow down spontaneously, i nearly fainted because my heart slowed beating, almost stopped completely.