Hi there, three days ago the left side of my throat began to feel sore, which had now spread to the right side and I have been coughing up dark green/brown mucus. I also feel sweaty. Further, I just looked in my mouth with a torch and I can see red veins at the back of the throat and on the roof of the mouth, which has a slightly yellowish tinge. I am not sure if this is anything to be concerned about. Thanks.