I've recently been having these "episodes" where I become super negative in my thinking, yet it all feels very calm and clear. It almost feels like moments of lucidity where I realize "none of this matters, I think I've done enough for the world but I'm not a good person and I think the rest can happen without me". The reason I say they're intense is because despite feeling calm and clear, I don't question the negative thoughts at all. I'm immediately convinced. 

But they pass. I will eventually either get home, forget about them and relax or go to work and be my usual self. I don't feel upset when they happen for the most part, they don't seem to be triggered by anything. 

Just feels odd, and I don't believe I'm chronically depressed. Has anyone had similar experiences?