I have been sick for 3 wks now, it started with a sore throat, the next day sore throat was gone and major nose congestion and very tight cough. The mucus in my nose keeps going from yellow to green and now the phlem that I can get coughed up is yellow. It hurts to swallow deep in my throat, hurts in my neck and jaw but only on the left side. I have not had a fever, but have been very cold and then tend to get rather warm. I am extremely tired and almost feel like I cannot fuction at times. I have also had a lot of weezing. Should I go to the ER?