Pyromania Support Group
Pyromania is an obsession with fire and starting fires in an intentional fashion. Pyromaniacs are identified specifically as not having any other symptoms but obsession with fire causing their behavior. Pyromaniacs start fires to induce euphoria, and often tend to fixate on institutions of fire control: fire stations, firefighters, etc.
Try talking to his doctor about this.
I spent one year off my meds and my anxiety skyrocketed to such extreme I was scared of starting fires to release that anxiety. I started carrying a lighter every where too. I bought an old firefighter turnout gear jacket because it's heavy and feels like a hug to calm my nerves. Have you tried a weighted blanket?
Anyway, since I'm back on my meds, I haven't needed to burn anything.