You mention you don't use drugs but then you start talking about being an activist, potentially doing something extreme, and looking for "jobs for people with depression". The problem is that all of this still screams "baggage". Maybe not as bad as a hard drug problem or criminal record, but it's still "baggage" that nobody would want to deal with when there's plenty of other people that either don't have it or hide it well enough.

When you're looking for help and handouts, "going against the grain" is not a successful strategy, so you need to put all the activism/strong morals/etc aside and never bring it up. Make up a believable backstory about yourself that doesn't bring any of this up nor raise suspicions to explain your predicament to potential employers (someone with degrees in knowledge work applying for menial work is more surprising than a blue-collar worker) and use that to slowly rebuild.

> Is that what I should do... emigrate back where I came from?

If I had to choose I'd rather be homeless in Europe than the US. The latter is a country where fucking the little people is considered good business and so much existing business relies on that, where moneyed interests have effectively seized control of the government and where the general groupthink would be against (or can easily be convinced to go against) anything that would help the little people in fear that it would be "socialism" - definitely not a good place for someone in this position.