Artisitically Depressed

I realized tonight when I should have been working on my ten page paper due on friday at noon that I can only draw well when I am severly depressed. On Passover I was manically depressed and was even hiding under my bed for a few hours listening to the same damn Morrissey song over and over again, I drew in my opinion the most beautiful thing I’ve even done. Yet tonight I spent three hours scribbling pretty much. I know most artists and writers can only work well depressed but how do I go from renaissance-like talent to cave drawing in three days? It is like only parts of my brain work well when other parts of my brain (reason and logic) are offline. I feel like I am a constant state of evolving and devolving depending on which chemicals are moving through my brain.