Getting worse at chess

Lately I have been wondering if it is possible to get worse at chess. Of course, I realize that over time, with too little practice, one will get out of shape. However, this is not what I am thinking about. It seems that my game has become increasingly worse over the last few weeks, and I feel more and more insecure about all aspects of the game. Maybe it's a confidence thing, maybe I have not been getting enough sleep or maybe I have just been playing to much bullet. I don't know, but it does not feel right. Anyway, I think I need to play more serious games and do proper analysis. Bullet and blitz can be fun, but it does not help my development. Shame on me!