2 days ago I started a quest titled "Confidence Man". At the end of the quest I had to clear out some location called Beantown Brewery and rescue Vadim. After I cleared out most of the raiders and such there were 2 guys, Bull and Gouger, who would not die. I would shoot them, then they would sit on the floor and regenerate in 30 seconds. And when I walk up to Vadim and try to talk to him, he just says "Please, save me". I tried to just leave the building and not finish the quest but now I have invincibility and Trevor follows me around everywhere I go. If I load my last save, I lose about 7 hours of playing. And I've completed lots of quests in that time and I would rather not have to re-do all of them again.