I imagine "depression" falls into soka parideva dukkha domanassa upāyāsā (sorrow, lamentation, pain, grief and despair); that is often caused by different forms of craving; such as not getting what the organism wants or needs.
That works too, although Dukkha is different from depression or stress, usually people who have depression find it hard to get out of bed or find any form of motivation, it does seem to be in a category of its own and may not be defined exactly in the texts.
I haven't (and I spent years working in a very large meditation centre that was part of seekers travels in Asia; so I met thousands of people who were practising in different places thoughout Asia). But i have seen a few very unhappy and confused individuals put in lots of hard work and come good; even now ordained as bhikkhu and bhikkuni for many years. But I have never seen any "miracles"
It would depend on what your expectation is of a miracle, if a person can transform from what they see as hopeless or fixed position then I would consider that as a miracle of transformation. So coming good i would consider a marvel or miracle and wondrous of the power of the teachings.
Mostly I tend to see the whole of life in miraculous terms, or with a sense of wonder. A seed can produce a tree, even in the ordinary if its studied with some mindfullness and non judgmental conceptual awareness everything is a miracle, it depends on the state of mind. how the body works is a miracle, how food is digested and turned into energy and consciousness is miracle of nature, there are many things that happen by their own laws that are outside of human control.
To give some ordinary examples, many people have been cured from heroin addiction where everything else failed by practices and support of sanghas, terminal illness through systems such as pancha karma. People have gained so much benefits from the discoveries of the enlightened, to transcend karma and mind conditions is also a miracle or a wonder and the power of the teachings.