Octomom -- I'm Dumping My Pain-In-the-Ass Home

Octomom has had it up to here dealing with her beleaguered Orange County home -- vindictive neighbors, endless mortgage troubles -- so she's decided to cut her losses ... and put it up for sale.

A rep for Nadya Suleman tells TMZ, she hasn't paid her mortgage in three months because she doesn't want to live there anymore -- and the place is scheduled for foreclosure next week.

According to the rep, Octo's going to try to sell the home before the bank takes it -- but if she fails, c'est la vie ... Nadya just wants to get the hell out of there. Credit score be damned.

The rep says Octo had the place appraised recently for $500,000 -- pretty good in this economy ... but the bad news is she still owes $450,000.

Nadya's list of grievances is endless -- but the rep tells us, Octo simply can't justify the $3,500-a-month mortgage payments ... especially when the place is in utter disrepair (video above).