My son has copd and divertilitis plus diabetic. at age 39. how can i prepare for the worse ?

See below: If he smokes, he needs to quit; if he is overweight, he needs to lose weight. If he maintains a healthy lifestyle and follows his doctors' advice religiously, there may not be "the worse". He is quite young to have copd. Ask his doctor if he needs alpha-1-antitrypsis level checked.

Palliative care: Find out if there is a palliative care service near you. They can help with setting reasonable goals, providing resources to make everyday life more comfortable and provide some coping techniques for you. Good luck with a very difficult situation.