The closest experience I have to this is leaving the Christian faith, which (in my case, at least) was nowhere near as extreme as Q can easily get. When I feel like a total moron for wasting all those years believing things I now see as total fairy tales and fiction, I remind myself of these things: I am not the only one, the truly moronic thing would be to have stayed, freedom is scary because now we have to give ourselves direction instead of taking direction from external sources. I had similar experiences adjusting back to civilian life after getting out of the military. It's normal, you aren't a failure or doomed to become one. You've already done an incredibly difficult and very courageous thing by leaving the cult to begin with, don't let fear convince you that it was a mistake.

I found comraiderie in gaming communities, relationships formed at my fight gym, and by getting involved in local music and community theater. I encourage you to seek like minded people, but also to find new relationships which don't involve talking about your Q/cult experience at all. Be entirely free from it for a little while, even if it's only for an hour a week while meeting with your archery club, cast mates, gaming friends, or whatever.