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It made my heart beat go out of rhythm

Yikes, I stopped a few months ago as well

Scary stuff! why did you stop?

I would sweat more than usual + tired by the evening ... But I was feeling much better about a week after I stopped all caffeine intake (my beloved rockstar organic had to go too).

I find black or green tea helpful. You still get a push and you don't crash so fast like with coffee.