Replying to Help me. Blackouts +k

So here is the story, last night i was with some friends and i set up my first keystone to shotgun. I had an empty stomach i hadn't eaten for about 6 hours. I accidentally made the hole to shotgun from a little bigger than usual but it didn't seem to matter. I shot gunned the beer and felt completely sick to my stomach. I felt as if i got up to fast and was light headed but it kept getting worse and my legs gave out and then i woke up to my friends calling my name asking if i was okay. When i woke up i was laying on my back and i felt high for a little but i snapped back into reality after about 5 seconds Does anyone know what actually happened to me i am still puzzled. I usually can chug beer fine with no consequences and feel fine but one beer just put me out for some reason last night