Have recently been feeling a strange feeling of a foggy type head, disconnected and difficulty concentrating?

I have recently started to experience what I can only describe as sort of 'disconnected' feeling, almost like I feel drunk/high but Im not, and have great difficulty concentrating. I have also been experiencing difficulty with my congnitive function i.e short term memory and language. I am getting worried about this, as I am only 25 and dont know what is wrong? I also had blurry vision so I recently got glasses thinnking this would all go away but my eyesight is better but I still have the cloudy type head? Please help me with some answers?