Sinusitis+Throat

Hi,
About 1 month ago I went to my Asthma doctor, and he told me I have allergies to grass, which I have been playing soccer on. My symptoms were having a cold plus coughing up mucus. He gave me Amox-Clav 850MG to take every morning and night for 1 month. He also told me to get a CT Nose Scan. The CT Scan showed that I had something wrong, so I went to an ENT Doctor, and he put a long tube with a camera in my nose, and everything showed OK according to him. He prescribed me Cefdinir 300MG for 1 month, and I have only 3 more days left. He also told me to use Sinus Rinses + Expectorants. I am beginning to get worse symptons. I have now a very bad cold, all the time I have yellow mucus coming out of my nose, and I have to blow about every 10-15 minutes. I have swelling under my eyes and on the top of my nose. Is it safe for me to go to school? Is there anything I should do other than wait for it to go away?