A man, upon meeting god, asks god for 1 favour,

the favor is to return him to earth so he can feel pain.

Is this notsalgia , masochism, or a sense of loss or ignorance of gain?

not that that actually happend or we know its possible to happen which makes the question post kind of random and sensless…

maybe you should use a better and possible in real life example example that way your answer could relate to real life and could be used to gain knoledge rather than wild specuation without a good reasononing of the event even possibly taking place…