First time drinking, got black out drunk, cause, meaning, precautions for next time?

So i had a sesh at my mates house last night, had 15 shots of vodka and by 10pm its as if i didnt exist, i completely blacked out its as if someone else controlled my body while the real me just stopped existing for a bit if that makes any sense? What caused this? Is it normal? I have ADHD which i take 30... show more So i had a sesh at my mates house last night, had 15 shots of vodka and by 10pm its as if i didnt exist, i completely blacked out its as if someone else controlled my body while the real me just stopped existing for a bit if that makes any sense?

What caused this?

Is it normal?

I have ADHD which i take 30 milligrams of equasym XL for, is that the cause?

How can i not black out in the future if i drink that much again?
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