Coughing up green phlem, raw throat on antibiotics?

For two weeks I had a minor head cold. Some stuffiness in the am and minor sinus pressure that went away with Tylenol. That went away and I was doing fine then about three days ago I woke up in the middle of the night with the worst sore throat ever! By morning you could see no definition between my jaw and neck and I felt like I had been hit by a truck. I went straight to urgent care and was told I had strep throat. I started penicillin and went home to rest. The second day I started coughing up thick green/brown stuff and feeling nauseated. The throat pain itself has been nearly unbearable but now the third day I have horrible throat pain my body hurts all over, im still coughing up the green stuff my ears ache and burn I have a fever and I can barley get out of bed. I called the dr and he said it takes time for the antibiotics to work and to just be patient. I feel like im getting worse everyday if I miss a dose of Tylenol my fever goes back up to 103. I think after three days and 13 doses of antibiotics I should be seeing some improvement. What is going on should I go to the ER?