Wow, Deb - I don't know what to say. Your H needs therapy VERY badly or he might hurt himself or you (or the monster). He NEEDS therapy. And it's very manipulative as well to take the shotgun out, when you were only gone for 2 hours.
Personally, if it was * me *, I'd see what I could do to get him help and then leave. He is really sliding down a dangerous path and I don't want to see you and your son get hurt. This isn't about being sexy, he seems to be slowly going insane and I know you don't want him to hurt himself - but he could hurt all of you.