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You may be suffering the "famine effect". Google it. Amanda Sainsbury-Salis has written a lot on this. There is a link somewhere in the forum discussion threads, you could search for it here too.
The remedy is to eat! Take a break from 16:8 and just try to eat according to your hunger with nutritious whole foods that will satisfy your hunger. Then when you feel like your hunger is under control, go back to 16:8.
Best wishes and good luck.