Sinus infection and short term memory loss lack of concentration

I am 30 yrs old and all around healthy.I think that I have a sinus infection. I had a viral infection a few weeks ago and was treated with anitbiotics. Since I have been getting over this virus, I ahve been quite foggy headed which in turn makes me think that I have problems remembering short term things. I am worried that I am actually making things worse by dwelling on it, but can sinus pressure cause any memory type or concentration problems? I have a slight imbalance that is getting better and when I wake up I feel great. I am very stuffy however and am taking Benadryl for sinus congestion. Some phlem in the morning, but the pressure in the front above the eyes last most of the morning and then clears up by evening. I have never had alergies before (that I know of) and other than some of the pressure do not seem to have a typical sinus infection, i.e runny nose, itchy eyes, cough etc. I do live out in the country (several years and we do have mustard weed) and also work in an office connected to a cabinet shop. Every once in a while my right ear pops and rings for a few seconds.Any ideas on what to do would be greatly appreciated.
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