It could be servere anxiety causing you problems or one of your medications. I've noticed the same slips in concentration and skipping words in sentences, etc. I think it started when I started Klonopin but it's still better than the unrelenting anxiety I was having. You are not crazy but there my not be a finite reason as to why this is happening. I'm sorry to say. You might want to consider seeing a pdoc and having an assessment done. I know it not what you want to hear but it could have a mental health reason.