SuStel:

...

I know there is no simple answer, I just want to be sure I've understood your explanation. You tend to use *-eghmoH* when the subject can control or influence the required change. *Cause yourself to be un-alarmed or relaxed* makes sense, because *becoming relaxed* is something one can actively do (with exercises, analysis etc.). *Don't cause yourself to be alarmed or nervous* makes no sense, because *becoming nervous* is something one cannot *cause*, something one doesn't control, it's a state one is brought to and therefore you cannot command someone not to cause a state she or he is not able to cause anyway. Or am I missing something here? Yes, that's pretty much what I mean.

I'm happy I could figure it out! It was very clarifying.