I've been in many similar situations. People wanting to socialize when I am in my most intense "Touch-Me-Not" moods causes me physical pain; I can't eat, I can't talk, and I just want to be left alone. I hate to be mean to them, and I just wish they would understand instead of trying to analyze and "cure" me.
You have to tell him in no uncertain terms that you need your space -- peace and quiet, preferably alone.
Good luck.
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