I think knowing what you want and picturing it are far better strategies in the long run, although they take a good bit of self-control and effort. The more we can do that, the easier it is to act in constructive ways all the time, I suspect, because it will just be a part of us rather than something we really have to think about. I'm working on that too, but it's one of those things that takes time, and it feels oh so easy to slip.
It seems to me that there are just a lot of tough days, period. Right now, I think it's probably pretty normal for the tough days outweigh the normal-ish ones. I certainly understand the panic, too - sometimes things just get seriously overwhelming. If you're panicking, one thing that's worked for me that I read about somewhere is to do a few pushups to get some of the energy out and work off the fight or flight response. Might be worth a try too, if things are bad.
M - 34 H - 36 Together 10 years Married 4 years BD - March, 2014