I don't have any social anxiety issues but I do have generalized anxiety and can relate to the feeling if not the cause. Anyway, while reading your post I had a thought, could you write down what it is you want to say? Or maybe write down enough that it will get the conversation started? Just write "I'm afraid to say this out loud" at the top so he knows why you're handing him a note and then write what you want to say. He'll probably start talking at that point and I'm hoping this will open you up and you'll talk.

I'm sorry you've been crying yourself to sleep at night. I know that kind of misery and I'm sorry you're going through it. I hope you start feeling better and that you'll keep posting on PC so we know how you're doing.

Cyran0