This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
愌 combines 忄 (heart/mind) with 奐, which likely contributes sound. The exact historical development and original meaning are uncertain.
The heart radical 忄 beside 奐 suggests a state of mind, but without a clear meaning, picture a heart that is expansive or overflowing like the shape of 奐.
For カン, imagine a can of feelings: the heart 忄 is full of emotions, and you can (カン) open it to let them out.