As The Old Jewish Saying Goes, And As I've Lived Especially Of Late...

What's keeping calm when you're Jewish? What's not worrying when you're Jewish?

As for me and being a Jewish Christian, I get the whole "Do not worry", "Come to Me, you whom are weary...", "Cast your cares...", etc.. Notwithstanding that (and here goes the "Oh, you of little faith"):

1. Having Cerebral Palsy and IBS affects worry for good reason.
2. Having OCD/Anxiety and ADD affects worry for good reason. By the way, I'm actually not the first one to have made an observation regarding whether OCD/Anxiety is inherently Jewish, and I was joking about that more to cope with my own OCD and wondering (so much for Jewish humor, as I got a hard time for making that observation)—the schtick about (I kid you not) OCD being a "Jewish disease" (as Dr. Avigdor Bonchek phrased the schtick whether OCD is Jewish) has been around for a long time. To be fair, look at, e.g., B'midbar 7 alone—having to be perfectly scrupulous about the right number of the right offerings like that could cause anyone to worry—then look at Vaiykra 11 and B'midbar 19—I myself (assuming that I'd survived birth and even had some part in Jewish life) would be washing and extra washing all day. Then try the fences around Torah. Overtime, that has to get embedded into one's genetic code and/or brain chemistry—thus, I think, part of why God desires mercy over sacrifice and obedience over burnt offerings, as His point seemed to be that ritualism as opposed to simply living by faith (e.g., "walk[ing] humbly with your God").
3. Getting the amount of hate that I get (as I probably will over the observation above, for example), whether rightly or wrongly, affects me to always worry for good reason—even, e.g., who's going to unfriend me on Facebook or unfollow me on Twitter, thus reflecting online how what they think of me both online and offline? After all (as Curt Schilling of all people stated), people online are who they are offline and what they would be offline "if they could get away with it" (which he stated after two of his daughter's high-school classmates used Twitter to send her rape threats.

I could give more examples, though I think that three examples suffice—especially as I brace myself and bide to see how many more instances of Example Three will happen even over the next couple of minutes, especially in regard to Example Two.