merametus
noun
Anxiety about an improvement to one’s life due to a fear that the improvement will not last.
Don knew he should have been excited at the positive press his restaurant was getting, and on one level he was. But he couldn’t shake the merametus that just when he was getting used to the success, some influential food critic would give him a terrible review and it would all come crashing down. He almost wished he could just stay unknown, so that he would not have to fear returning to that state.