Is this strep or something else?

sounds a bit like tonsillitis. get it checked out asap at the doctors cos if they catch it soon enough it'll go away no problem. they can also offer help with your purging, having gone through that myself i found the combination of the doctor giving me advice and my parents monitoring me i managed to stop quite quickly. for your throat, try to have warm drinks rather than cold, keep your throat moist by sucking on some lozenges and take some ibuprofen cos that'll help ease some of the swelling. hope this helps:)