I'm sorry for what you're going through, but I also admire your strength in doing the right thing. I hope your fiance can see that, if he ever needs it, you will stand by his side just the same.
Okay, the pain issue. Ridiculous. I'm a health care provider, and would not hesitate to control his pain. Seriously, it's not like he's going to become addicted..he already is. He's dying, they're not going to save him from his addiction at this point. But they can show some compassion and humanity, give him what peace they can. Talk to his insurance company, his doctors, get him into Hospice care.
Love and prayers....