There are two neologisms derived from schadenfreude for the happiness/joy from (caused by) one's own misfortune:
They are used or discussed in various online sources and books in Google Books. There are some sources claiming the coinage of these words also.
The American author AJ Jacobs coined a term for it: autoschadenfreude – the joy we take in our own misfortune.
God Bless the NHS - By Roger Taylor
Noun. A malicious satisfaction in the misfortunes of yourself.
I'm just going to stay in tonight and sulk: I'm really feeling the autoschadenfreude.
Urbandictionary entry for autoschadenfreude
In the ongoing effort to enrich the Blogospherical vocabulary, I offer Selbst Schadenfreude, which I will translate as meaning "the malicious pleasure taken in one's own difficulties or downfall."
The Ik have taken Schadenfreude (German for "joy from someone else's misfortune") and improved on it, turning it into, to coin a term, Selbstschadenfreude (joy from one's own misfortune).
The Five Stages of Collapse: Survivors' Toolkit - By Dmitry Orlov (2013)
As a common expression, there is wallow in self-pity/despair/defeat that can be considered depending on the context.
wallow in self-pity/despair/defeat etc
to seem to enjoy being sad etc, especially because you get sympathy from other people – used to show disapproval
He’d been feeling sorry for himself, wallowing in self-pity.
Longman Dictionary of Contemporary English
- Sadness caused by the fortune of self:
I believe the phrase tears of joy comes close as a common expression. There is also bittersweet for the mixture of sadness and happiness. However, I'm tempted to coin autoglückschmerz.
- Happiness caused by the fortune of self:
Simply happiness can be enough. Other words like joy, delight can be used depending on the context. If it is happiness from a life well-lived, happiness that spans across lifetime, there is the term eudaimonia. It is like a combination of well-being, happiness and flourishing; and the concept comes from Aristotle's Nicomachean Ethics. But again, one could coin automudita also. 😊