Hi, first of all I think you need to breath. You have been working on this for two years of your life.

Someone some where has complete faith in you, that is why your in the position you are now. And you got the chance to do a PhD. You have it in you. I know you can do it. I myself have been looking for a PhD for 3 years. You need understand that you are one of the very lucky ones.

Just formulate your thoughts. Your panicking. Go out have a great day, listen to some music. Just get away from it for a few hours. Then get your creative flow going- do a sort of mind map, what you have done, outcomes you created, the ideas that resulted because of the outcomes you have attained - look at work that supports your ideas (already published if any) - ones that don't. Formulate, determine an outcome, write what you have been doing day in day out - that is second nature to you now.

You have the knowledge its in your mind set. Just apply it to paper. You really need sit down and find your self. And the courage to do this. You have the ability. Otherwise you wouldn't be where you are right now.

I know you can do it.