You know that felling you get right after years of stress/major depression..how do you hold on to it?

im very very very very depressed/stressed but today all of a sudden i feel good like really really good because its the first time in forever that i felt the preashure lifted off my chest and can see life clear again...... but i know it's going to go away really soon.....is thier anyway to keep it and truely be free from depression? i dont think i can go trough all of it again......i feel i can now organize evrything in my life but as soon as i start trying it will come back