Yeah, that is a very harrowing experience, and must be very hard to get through it...
I wish his suffering came to an end, and I wish all the strength for you, you will need it. Go to a shrink if you dont take meds yet, take benzos and antidepressants, benzos will at least dull the emotional pain in next days. Dont take them longer than for 2 weeks at a time.
Unless you dont give a shit and want to join him soon, then I am even more sorry for you...
This forum has many uplifting stories of people CTB on their own terms, but at the same time is full of those experiences, which are hard to put into words..
Be strong, at least try to...