Calpurnia, we are in a very similar position. DH diagnosed two years ago with bowel cancer, now has a stoma, unfortunately it has now gone to liver and lungs. He is now receiving palliative care. I could have written your post almost word for word. It is a very lonely place to be in, Friends have practically disappeared, they just could not cope with our situation. I have been told to take care of myself, take one day at a time etc, but it is so hard. We have joined a local Cancer Care support group which offers counselling, different therapies,massage etc and have found our sessions there really helps. Just being able to talk to people who really do understand. If you have something similar in your area I would recommend it.
Otherwise, we just stumble from day to day, take the good with the bad and make the most of what time we have left together. He is fantastic, very upbeat and still has his sense of humour but I get bad days which I try to hide from him. Being strong all the time is hard, and it’s certainly not weak if you crumble from time to time. Sending my very best wishes.