HELP! - lost access to "Q" key and can't finish blood pack mission

Hi- moved some keys -rebound- and one the keys I used was “Q” - when I next needed to use “Q” --to apply blood pack in side mission - noticed what I had done. Removed the action I had bound to “Q” but when I try to use “Q” for apply pack—nothing happens! “Q” does work for example - spawn vehicle. I deleted game and tried again - still doesn’t work. Any config files i can alter or what my options??
Thanks to any who help.

stop…stop…stop…I am a blind old man…action key I needed is “0” not “Q” …getting old sucks…