Am I allergic to the sun??

Okay. So I went to Europe last summer with the people to people organization group thingy.. Anyways a couple days after I got there, I woke up with swollen lips. It was like 46 degrees Celsius which is like 120 degrees F!!!! Everyday we walked in the sun for miles and miles, and this just got worst. It spread over my body only where the sun was exposed to my body. There were first tiny little bumps on my swollen lips, then it spread to my face then to my neck, chest, and arms. I was so miserable. Luckily, one of my leaders was a nurse. So she took to the pharmacy to get some hydrocortisone. It helped, but they weren't fully gone. so when it started to clear up, the little bumps went away leaving light spots everywhere the bumps used to be. Mind you, this reaction appeared everywhere my skin was exposed except for my legs. So yeah. This happened a couple of months ago too. I was at the park one day and the next morning I woke up to find that my lips were swollen again! It went away after a few days. The last time this happened was yesterday. I went to the water park and was exposed to the sun and chlorine.. This morning I woke up with swollen lips. Its itching and everything. It has always itched. What is this?? Did I catch a disease in Europe?? I was swimming in Europe too, beaches, oceans, pools, etc.. Does chlorine flare it up more?? Someone help, please and thank you.