Sun poisoning?

Is there a bug going around or has the sun gotten really intense over the past decade? I went to the beach last Thursday and laid out for two and a half hours. I had spf 30 on from the waist up but I didn't put anything on my legs because I wanted to catch up on color. I ended up making a pearl* all night since I didn't get a chance to shower before going to work that night. I spent the next morning hot with a headache and ended up vomitting the three glasses of water I drank in attempt to rehydrate. What the heck?

* making a pearl is what happens when you have sand stuck up your kooch.