I wanted to reply to those two sentences around a couple of days ago but I had put it off. That quote, up above, sounds so much like me. My GP said that I had depression but didn't go details as to what kind it was.

I'll have times when I would feel great but then it's so easy to sink down. Either I will think of something coming up that I'm dreading, something is going to go wrong (in my imagination), or most of all someone will upset me.