Can you die from liver stones? Watch
Lots of people leave intensive care units, even in their 80s, the ICU is just a place where you can get very focussed nursing care when you need treatment every half hour or so and lots of monitoring. Make sure you ask all the questions you need to from the doctors and nurses.
Stay calm, I understand that what you are going through is not easy and requires patience, but try talking to your family and keeping each other's company. Regarding medical questions its always best to ask the treating consultant as they know the patient best, and dont be afraid to ask questions.
All the best