My mom has been in stage 4 COPD for over 2 years. I am her caregiver and help her with everything. She is on 3 litres of oxygen 24 hours a day. She is on morphine (a small amount) and is mostly confined to being indoors. She is very weak and always SOB? Her days are the same over and over. How long does a body survive this hardship, day in day out ? Does anyone have a similar story?