@denise96. With the amount of narcotics your husband is taking, he most likely doesn’t need the Claritin we’ve talked about over the past few days. He shouldn’t be feeling the bone pain with that level of meds. So that’s one you can take off the table.

You’re carrying a heavy load of emotions, my dear. Goodness, it’s ok to have morbid thoughts and in no way are you being selfish! Having your husband being in this precarious health has you both on edge.
Quite frankly, having ‘end of life’ discussions is one of the most stressful things families can go through. @dbamos1945 (Bette) touched on some good points about possible things you can do right now to help face the potential reality of the current situation. Talking to your husband frankly and husband’s doctor is an excellent idea.

Your husband is undergoing treatment and it hasn’t had time to fully work yet. He may come out on the other side of this with many more years. However, right now he has risk levels with his COPD, meds and, resistance to wearing the mask that could help him avoid the respiratory distress, a trip to the ER or possibly having your worst fears realized.

I was my mother’s caregiver and often wondered what I’d do if she passed away at home. What do I do first? Well, she ended up in a care facility where she eventually passed away. I was with her at the time. Being in the nursing home helped make her final days so much more easy being with people who could give her the care she needed when I could no longer lift her out of a bed. Your husband may benefit from a care facility right now until he gets stronger.
In the meantime your concerns are certainly valid and creating unimaginable stress. You know me, I’m always here with the articles. Here are a couple for you. First one is:
~What to do if someone passes away at home
https://www.usatoday.com/story/community-hub/funeral-planning/2020/03/24/what-do-if-someone-dies-home/4933853002/
~ Checklist. What to do when a loved one dies
https://www.aarp.org/home-family/friends-family/info-2020/when-loved-one-dies-checklist.html
Maybe in some small way these will help you at least form a plan of action ‘just in case’. Let’s hope and pray that you won’t need them any time soon.