Depression relapse?

Someone posted on here a list of what they do after a depression relapse which I didn't know happened to other people. I thought I was exaggerating my feelings or making these feelings up in my head but now I feel a little bit less insane. I haven't had any that bad lately earlier this year they would last months at a time but it's been okay recently until this week. I have been feeling so depressed this week for no reason at all and things like brushing my teeth or getting out of bed have been so hard but I know it'll pass. Anybody else experience this?