I know what the slippery slope feels like, I've been through it so many times before.

Is this fall inevitable or can I stop the slide? I feel the depression coming, I can almost see the black cloud on the horizon. Is there any way to stop it in its tracks before it takes me down again?
If I go for meds, they will take 6 to 8 weeks to take effect. I'll be IN the pit by then.
Any advice/ideas are welcome. I have to make it through school but I have come to think nothing is worth anything and I am useless and stupid. My confidence has disappeared and my self-esteem has gone down the toilet. Depression is only one step away, but I desperately don't want to fall into it again.
Help? Any ideas?

Tina