Is it normal that my emotions change so intensely and so fast?

During the course of a day I will feel extremely happy (so happy I feel like my life is the most amazing thing ever and I'm very motivated) and extremely miserable (extremely guilty like I did every mistake in the world and I need to lay down in a foetal and not move) in succession with each other. There is no good reason for this. It's always been like this a little bit but it's gotten worse lately. It's starting to negatively affect my life. I don't know what to do...