That would be a type of "reactive" depression. It may be that you have a depressed mood because of your situation, although whether it becomes a Major Depressive Episode is a seperate issue.
It's quite normal, and quite healthy, to experience periods of low mood when our circumstances are shite. Those feelings, even though they're pretty unpleasant (putting it mildly!), are actually serving a purpose - they're letting you know that something about your situation isn't okay, or isn't something that you're used to having to manage.
Are you in therapy or do you have a good support network? Do you have other things in your life that you find important or meaningful?Taking steps to get the dissociation manageable may well be key to improving your mood.