Maybe we can close the day with a remark about the 'CO via car exhaust' method, if I tried this I would think about grabbing the hases at the, what's that in english, the manifold (really ? Dictionary says so), and lay a tube from there into the interior. I helped change a fuel pump last year, so I roughly know how a car looks from under... but I would rather buy a cheap generator, you get them under $100, these are sure to work but they really create terrible exhaust gases, not just CO. You are either tough enough to bear the smell, or you make a filter (hard to fix to generator exhausts, which are ridiculous affairs).
Then, sans high buildings, there's the guns - if you can't get a short-barrelled shotgun, use a revolver rather than an automatic 0less bulky, a nine in the mouth makes you speechless), certainly nothing under a .38, use something like silver tips for bullets, in doubt metal jackets. Here's an image that shows where to shoot, barrel into the mouth, stand beside a mirror and shoot almost horizontally, just slightly upward. You want to hit the lower part of the brain, the beginning of the brain stem.where it starts to lead into the spine. That's about the size of an eye under where the red glow is.
But seriously, the CO should work just fine if you treat it like a friend and give it a second chance ;)
I can't see what they would be able to actually do for you in the hospital, we can't do much about the brain at all. I wanted to ask about vertigo, because that's what you get first of course, I hope there's nothing messed up with your inner ear - expect this to go away, but you can of course tell them you barely escaped your garage, in which a generator was running. I haven't yet heard of a miracle drug that restores brain regions that suffered from asphysiation effects, the brain deoes that on its own, it may take time. Sleep, taking a sleeping pill will not do damage. Avoid alcohol. And I hope you made sure the dogs will be taken care of ???