I have a bad sunburn, and now i can feel hot blood rushing through my legs, what can i do?

Today, i went to the beach for about 2 and 1/2 hours, and I've never had a bad sunburn like this before. I had no sunscreen that wasn't in date (all of mine were expired). One area that is really sunburned bad is my right leg. It is very swollen, and is bright bright red. I can feel warm blood rushing through it while standing and sitting (reclined with legs up) My other leg isn't like this at all, so what I'm thinking could contribute to the leg is this: I had a softball game before, and i had to wear this tight sox, pants, and a sliding pad on one leg. I'm not sure if the circulation is messed up, but i cant stand the blood rushing anymore. It's so annoying, and feels crazy! What can I do to help it, and what could it possibly be? THANKS!