Kelly, I am so sorry you are having to go through this. It is tough, I am a three time survivor, so I know what it's like to think your not going to make it, and I commend you for what your doing for your husband and your kids. That is also a tough thing to do. I had to take care of my mom and dad both in hospice care.
I can't answer your questiion, I just want to give you some encouragement. someone on here that has gone through that will answer before long, sometimes it takes a day or so. Have you talked to anyone at the American Cancer Society about trials? There is a link at the top of the page for Resources, you will find some info there.
Tough choices, all I can say is never give up,
I hope you get the treatment he needs, keep fighting!