Brain fog?

I was wondering if anyone has experienced this? It basically hit me and man is it the worst feeling ever. I feel very out of it, like spaced out lightheaded and dizzy. The feeling of my head being full. I've been prone to sinus infections these past few months. I recently made trip to the er and they seen I had fluid behind my ear again and pressure on my face but no infection. Tmi but no green boogers when I blow my nose but I noticed when I wake up that there is hard tiny green boogers. They gave me Nasel spray and nothing helped clear the ears. The pressure and pain from my ears is giving me jaw pain. Would the fluid behind my ears affect my head as in brain fog?