Based on your previous experiences with Candida, I'd guess it's that again. It's pretty hard to tell from those images alone; your physician should get you a quick Strep test, which can easily rule that in or out.

The way we've been taught I wouldn't expect Strep pharyngitis in someone over the age of 20 or so, except that my friends and relatives keep getting Strep, so I don't know how truthful that is anymore. If you're still taking any kind of immune-suppressive drug (I think you said you were on prednisone at some point?), that makes Candida more likely.