Sudden illness, whats wrong?

Last night I felt alittle weird but not too bad. This morning I woke up with a headache, abit of an aching bodys, and my eyeballs felt hot. I decided to ignore it and continue with my morning plans which was a hike. I did a intense 2 mile hike, got home and immediately layed down. Fast forward 6 hours, My eyeballs continue to burn, I'm too weak to barely even lift my head up, my body is burning and freezing from fever, I feel congestion in my lungs, my head feels like its in a vice grip, my body aches everytime I move and my jaw is cramping. Any idea what might be the culprit? I did go to a water park last Monday, acouple months ago I had an extremely aggresive case of the hives which appeared for about a week all over my body and dissapeared just as soon as they came. I have no idea what braught them on. I was ill for about 2 or 3 days acouple weeks ago, shakes, it felt like a really bad hangover, I lost my voice and that also came and went. Now I'm here today sick as a dog. Help.