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The sudden onset is really thought to cope with, I had same thing. Took about 3 months to start sleeping without medication, then another 6 months...
You’re far from alone. It will get better. Trust in time time and the power of your amazing brain. It will work around this problem.
Was in exact same place a year ago. Stopped sleeping, stopped eating. Thought I might have to end it myself. Chased after a hundred solutions....