For Some Reason I Feel That My Brain Does Not

For some reason I feel that my brain does not work at all. I am constantly confused, dizzy and do not know what I am doing most of the time. I experience multiple mental health issues and haven't visited a psychiatrist for treatment. My question is I have a really hard time concentrating and I have a habit of hair pulling? Is it due to constant stress? Also, I have issues with controlling my obsession over pornography and masturbation. It is a really bad habit, but I still continue to do it anyway.