I honestly think you have a major league sinus infection of epic proportions and perhaps an ear infection, too.
Recently .... I found out my sinuses were so infected (and I didn't have any pain/pressure/congestion - my only symptoms were I had no appetite, fog head and anxiety.
Turned out to be a sinus infection that was so bad, I had a double ear infection, too. (again, no pain. I do have a high tolerance so it's got to be brutal for me to feel pain).
I felt fogged out, no appetite, couldn't focus or think straight.
Went on Amoxicillin. Within 9 hours, appetite returned, .....within a few days, the foggy off feeling lifted, I could focus.
Sinus infections can be dry, and that's what mine was. It sounds like yours is, too.