I understand how you're feeling! Those sudden downward spirals are very disconcerting. Would it be possible to call tomorrow morning and try to get in with your pdoc or T for an emergency appointment? In the meantime, go easy on yourself and keep posting...I hope that this passes as quickly as it came.
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From the movie The Hours: "If I were thinking clearly, Leonard, I would tell you that I wrestle alone in the dark, in the deep dark, and that only I can know. Only I can understand my condition. You live with the threat, you tell me you live with the threat of my extinction. Leonard, I live with it too."