Sure, I will make a new appt with my regular doctor, but maybe you can help. I have had pressure in my head which cause dizziness, hard to concentrate and also brain fog. Not sure what is causing this, I ve had it for 3 weeks now. I took mucinex for a week to see if it would clear my head and it did no good. It s better in the morning after I ve rested, but then comes on again as the day progresses.