Before gettting rid of any of it, especially if you're contemplating doing it against his wishes, I would really want to talk to a professional. Perhaps I'm wrong, but I'm under the impression that the anxiety that may cause to someone who is a hoarder or who has hoarding tendecies may ultimately just lead to even more hoarding. That's obviously not what you want.

I'm not a mental health professional. It does, however, seem to me that you husband is doing one of several things: First, he's seemingly lost sight of just how much you really have and, second, he's not hearing you when you say that the stuff is upsetting and dangerous to you. That sends up a few alarm bell me.

That said, if you really think there's nothing pathological or dysfunctional at play, then sell/get rid of the stuff.