coffeefan-
I know what a high pressure job is about and I really feel for you. If its on a daily basis, try to keep music on. Even subconsciously, it’ll keep you a little focused on something else and it will relax you somewhat.
-Another thing you might want to try, as crazy as it sounds, is laughing. Laugh to yourself at nothing, or (what I try to do sometimes) just think of whatever happened as one thing on a list of crazy things that happen (we all have our stories). Once you remove yourself a little from the situation, most things which started out as major sources of stress become things that are really funny. Imagine it happening to someone else (someone with a good attitude) and how they would react to the situation.
-If you can anticipate a situation, walk in and tell yourself “such and such will probably happen, but its ok. Its not gonna get to me.”
frumladygit-
For one second (and I mean one second), put the Emunah aside. Think about how much Hashem loves you. You, with any flaws, just because you are you! Think about that and really internalize it. And once you do that, the “how and why” goes away and in its place comes “You’ve been running my life perfectly until now, so why should I think You’re taking a break.” Believe it or not, even on a small scale (and I talk from experience), it helps.
And like you said, talk to Hashem. I think if people would actually talk to Him, just whenever, from the heart, there would be a lot less depression.