There is no shame in this, there is just the reality that you were dealt with in an unprofessional way and I think that they will see it just like that.

If you're any good at all your boss will be happy to see you back but I wouldn't count on a raise or promotion until you've more than proven to be there to stay.

And it wouldn't hurt to have a solid backup plan just in case they do decide to lay you off at some point in the future.

Keep in mind too that since you left voluntarily that if they do take you on again it counts as a new employment, essentially you're a new hire. You may even have to re-negotiate your salary.

Being out of a job normally would be hard enough, but since your residence depends on your job there is a very important reason to make this work.