Sounds exactly like me. My depression will vary, the severity or how irritable I am, I go from sleeping all day to not being able to sleep even with medication and I would be exhausted. I have a few good days a month. Full blown manic maybe twice a year. But mostly I am jut hopelessly depressed. If you are feeling so low, I would bring it up to someone and perhaps there is a medication adjustment you can try. Dont give up! Tomorrow might be better!