Trapped inside my head!

I was diagnosed with OCD & anxiety 5 years ago. I'm used to the anxiety and problems associated with that, though mid - last year I started feeling numb and empty. I also always have this heavy blank feeling in my head, like a brick in my brain. It's scaring me because I don't have any thoughts anymore, (I probably do) but I can't hear anything in my head. You know how everyone has their own voice in their head? Mine doesn't talk anymore. I get really mad because I can't concentrate , I know that I could be doing lots of things but I just don't have the capability of concentrating!! I can't relate to anyone else anymore because to me everyone looks like robots and they seem emotionless. I know I am suffering from DP but I don't know what I can do to help myself concentrate & relate to others? How do I get rid of these feelings?? I'm also seeing flashes of shapes and lights in my eyes. Objects that I look at get stuck in my eyes when I look away. I'm really bored with my life and I feel trapped. I don't see the point of sleeping either.I can't work because of this.
If anyone has any advice to rid me of these feelings please help.
Thanks, Jade.