Suggest Treatment For Sore Throat

Hi, I did some competitive long distance running yesterday and really put in my all despite not having done any running or training recently. As a result i got a very dry throat (which i considered normal). However yesterday evening and today, I have had a very sore throat which is worse when i breathe or speak. It isnt stopping me from eating or drinking, however i have been off my food (which is very unusual for me even when I m ill!) I have been coughing up a lot of yellowish phlegm which often has blood in it. I was wondering if you could give me any help and advice on what i should do, thanks.