What's wrong with me?

It all started with a soar throat and then a low fever (99-100) then I was about to go to bed after 2 days of having the fever and it was basically gone I had gotten a rash I just ignored it and went to bed I woke up at 2 AM and had to itch so bad and looked at my fingers and they were swollen big time. What do I do?? And what is it??