Eh- I frequently drink while handling guns at home. Big deal. I'd still use lethal force against an intruder. I'd say the same thing to the cops whether I was sober or drunk.
"Officer, that man broke into my home and I was in fear of immiment seriously bodily injury or death, so I shot him to stop the threat. I want to press charges against him. I wish to not make any more statements until after speaking with my attorney."
Don't consent to a breathalizer. It'll take a long time to get a court ordered blood draw. Possibly hours.
Of course I live in pro-gun free states. YMMV in anti-gun states.
As always, caveat emptor!