it could be a bad sinus infection. this has happened to me. the sore throat could be due to drainage or strep throat. either way it sounds like you might need to get to a doctor to get tests and possibly some antibiotics.
i have a sore throat and when i blow my nose hard a thick gooey mucus mixed with blood come out. what could it be? . sore throat get worse when i swallow or even yawn fever on and off and thick gooey mucus/blood doesn't always come out when i blow my nose.