I have been sick for the last month or so...was running a fever, coughing, sneezing, and severely congested. I went to the ER and was told I had sinusitus and was given Amoxicillin and have been taking 2000mg a day for 8 days now. I saw some improvement for the first few days but now chest congestion and coughing is worse, running a fever, and wheezing sound down in my chest when I breathe. How am I running a fever when I have been on antibiotics all this time and what could be the cause or what is wrong with me?