It really is strange to hear that so many cats are experiencing the same 'sudden fearfulness'. Our cat, Tango, who went through this phase about 6 months ago, has not completely calmed down, but he has improved. He is still very cautious of the bit of carpet outside our kitchen, where he goes in and out every day. We read that it was important not to draw attention to the fearful behaviour because it draws attention to it, so that's what we have been doing. He is no longer afraid of my hairbrush, his food bowl, the closet or paper on the floor. Hopefully, your sweetheart wil be able to overcome his fears.