I don't know if anyone else here does this, but every time I'm either happy or stable, I'll write down all the things I'm doing. Music I'm listening to, movies I'm watching, foods I'm eating, places I'm going, etc. All the details. Then when I feel flat or depressed, I break out the list and will do every single thing on it that I possibly can. Usually it helps pull me out. If it doesn't help after about a week or two, in a milder depression, then I reach out to my husband first, to get some perspective, and then usually my doctor after that. But that depends on how bad it is, of course. Hope you feel more like you soon!