I Am 26 Year Old Male, I Have Changed Dramatically

I am 26 year old male, I have changed dramatically in the last year and it has put a negative effect on my family as they are very concerned that I am not the same person as I was. My mind feels like it is running on a CD, when someone looks at me I can't get their face out of my head, I wonder if they can feel me or know what I am thinking, conversations I have with people repeat over and over in my head, my mind is exhausted. I can't sleep at night, feel anxiety ridden and am anxious. At times I say or do things that may people tell me are inappropriate or do not match the conversation I am having with them. Sometimes I sing or laugh at inappropriate times, act like a kid and music stays in my head all the time. I feel I am going crazy and my friends call me crazy now. This all began in October 2014. I am an alcoholic but I quit 8 months ago to see if this was the cause of my illness yet, nothing changed. I had a scan of my brain and the results were normal. I have lost my job because I can not focus or concentrate on ANYTHING. Please help, this is ruining my life.