Wierd thing happened last night

Had a long day at work, drank probably 3-4 old fashioned bourbon drinks (2.5 oz pours) over 3 hours. well I don’t know what happened after that. I weigh 250 pounds and I’ve drank way more and been totally fine, but I was throwing up and my wife said I was doing wierd shit that I don’t even remember happening, and she told me in the morning she almost called an ambulance for me. I think I blacked out. But I’m positive I only had max 4 2.5 oz drinks maybe 10 oz of bourbon.

Mind you this was at home, and my drink wasn’t tampered with or anything, and I didn’t use any other drugs. What the fuck?