For me it's a constant ache that sucks out every positive feeling leaving behind negative ones like hurt, sadness, doubt and anger. I also feel like I have a burning ball of pain in my chest, kind of like heartburn.

I also have a hard time accepting it. I have a medical condition which doesn't really have many immediate symptoms which I have an easier time accepting. For depression it's evident that I have a ton of symptoms, but in my head I have a very hard time with it.