To me stoicism is helpful in the sense of the advice one gets in jujitsu: If taking one grip on something isn't getting you the leverage you want, don't grip it harder, let go and take a different grip.

Stoicism can't help if you're just getting traumatized, but a lot of "I feel awful about the world generally" sentiment boils down to having a tense grip on one's worldview, a rigid set of norms leading to the judgment that it is all wrong and terrible and thus to a kind of flagellatory self-harm. Nature as a whole, on the other hand, is indifferent - the "is" instead of the "ought". We learn many oughts when we're young, but they all deserve examination.