Wow...my sympathies to your family concerning this tragedy. I'm amazed that he is still alive. What a blessing.
I would suggest finding a local reiki group and see if someone will teach you in person. QiGong is less common, otherwise I would suggest that instead.
You may also want to see if they will allow a skilled accupuncturist to do some work. If not, read up on reflexology. In general, see if you can find a doctor who also uses alternative medicines. They are out there, it just takes some calling around. I can think of numerous herbal possibilities that could help him. But a doctor would be able to prescribe this as true treatment, which the facility would have to go along with.
Since you are still a beginner, I would suggest calling on a deity or archetype you are most comfortable with--be it an angel/saint, deity, etc. Set up an altar, present offerings, honor them once a week or once a month. Pray that they help your husband. When you give them offerings and hold honoring rituals, you are lending them energy, and in turn they may use this energy to help.
Blessings to you and yours.