You can also have a "deeply-disciplined routine" and get thrown out of it and hit depression because exactly by that one impact.

Source: Myself.

I’m not sure if you need to hear this but in case you do: There’s only one way to get back to it and the sooner you do it, the easier it is. First week is hardest, then the positive feedback loop starts kicking in. Do not to think about it, just get it done.