Crazy itching, burn, yet no rash... :/?

So, a couple of days ago, I randomly and mysteriously started itching all over my legs. It started itching and then burning really bad. It wasn't anything I ate, not that I know of. Then, after a day or so, my arms above my elbows started itching as well. Now, my left leg slightly above my ankle kind of hurts, still itches, doesn't really burn much. The burning has gone up to my arms and it just itches so bad to where, I can't sleep at night, my legs have a bluish tent to them, and my face has a yellowish tent to them. I've been drinking water. idk what's wrong. I went to Walmart and that's the only place I can think of that I might have caught something. My mum thinks it's in my blood b.c I have no rash or anything on my legs or arms, I ran a fever the night I came down with all of this. I'm going to the doc this Monday but, I'm not myself lately and this itching is like when you get stung by a bug or and ant bites you...It burned like a razer burn but worse. Any idea's to what might have happened?