Here you are again dear lady...also caring about others while struggling with the beast yourself.
I am always repeating myself here....you have heard it all before.

If someone is hell bent on ending their lives there isn't a thing you can do about it other than what you have already done. Tell them how much you care and how much their actions will change their loved ones forever. Give them the book Suicide, The Forever Decision, add them to your prayer list and give them a hug.
That's really all you can do...I understand about chronic pain and choices.
And I love you for caring so much.