As a person who neglected his diabetes for over 20 years, I always recall something my doctor said to me. The scene was his office and my A1C was up near 12, I was a mess and i decided I no longer needed doctors. I did not see one again for over 20 years. At that visit, he said rick when you get sick and tired of being sick and tired, you will take care of yourself.
I did finally get sick and tired of sick and tired. In those days I could buy insulin without a script and live pretty well. No the issue was that the longer I went the more difficult it was to get back to a doctor.
I finally found a therapist who helped me find a doctor and once I found one I was able to reenter the medical establishment and then found a an endo and now i see 14 doctors. At any rate this is the best advice I can give:
1. Do not preach, nothing shuts a person down more than preaching.
2. Remember, when they get sick and tired of being sick and tired they will get help.
3. Help them know you will be happy to help if and when they want.
4. Be careful to not judge. We do not know the whole truth of what goes on, and
5. Be compassionate and tell them occasionally the struggles you have. I also tell folks of my issues, in a hope they will tell me theirs. I never ask, but I do make myself the object of not doing the best. Sometimes they will open up. Usually not, but well sometimes.