If only I could sustain being in a normal mood for 3 consecutive days . . .

Depressive episodes blow over. I tell myself that when I'm in one. But now I'm bouncing back and forth between being depressed and feeling fine. The feeling normal doesn't last any length of time. It's great for while it lasts - maybe a day and a half. But it collapses too soon. I get over being depressed, but then depression slams me again. It's no way to live. Not planning any self-injury, but this is crippling. It's like trying to move around on ice skates when you don't know how to skate. I'm afraid of really falling apart.