Whats wrong with me??!!?

So it all started with a soar throat and then i had a low fever (99-100) and it goes away after 2 days and that night i look at my stomach and it has a rash i just ignore it and go to bed and i wake up in the middle of the night and really need to itch and i find the rash spread everywhere on my body! and my fingers are swelled!! What happened??!! And how do i get rid of it fast