<human>: Condense the text into a few key points

So I have a pretty uncommon skin condition called dermatographic utacaria ( which basically means that whenever my skin gets scratched or impacted it will swell red (yes, I can write stuff on my skin). 

Felt like going to the beach today but whenever I go in the water I get hit by waves etc, which makes my entire body go red for about an hour. Im pretty self-conscious about it so I thought I'd be clever and pop an antihistamine before leaving, which would hopefully stop my skin from reacting. It worked but for some reason I was super tired all day and ended up basically passing out on the beach for a few hours. Woke up sunburnt and tomato red on the entire front of my body. 

Got home and checked the box, turns out the antihistamine I took is a 'drowzy antihistamine' and I had basically drugged myself to sleep at the beach.
<bot>: I have a weird skin condition that makes me go red when I swim at the beach. Took an drowzy antihistamine to stop going red but ended up falling asleep in the sun and getting burnt red anyway.