For the last several months I have felt out of place. During the day I get this facial pressure around my eyes and nose.It makes me feel out of place and I cant think correctly. I have had a thick brown mucus (small amount) that comes up when I clear my throat. I just do not feel myself. I went to see my doctor and he said he think I have a sinus infection. I have been on antibitoics for 4 days now and I dont notice a difference. I dont have allergy problems and my doctor does think that an issue. Every now and then I see these floaters in my field of vision. Then they go away.

I just need to know whats going on because I do not have health insurance because I am in Grad school. Will they antibiotics eventually kick in , could it be something else? My doctor told me to call back in ten days and he will put me on something stronger. Im just tired of this. What can I do or what is wrong? I am worried I might have a disease or something. I do not have any stds and have been tested.

Optional Information:
Male , Age: 25

Already Tried:
over the counter, antibiotics, sinus rinses.