Kübler-Ross model – Explains the behavior of personal loss. The five stages are Denial, Anger, Bargaining, Depression, Acceptance.
Kübler-Ross psychological model - Explains the behavior of personal loss. (Being sick for long periods is a personal loss.)
Most of the chronic patients are in the first three stages of grief. (Bargaining only applicable in life-threatening situations) Only during the acceptance phase, together with the hope that recovery is possible, people accumulate the forces needed for healing, often with significant changes in lifestyle.
If you look on YouTube at extraordinary recovery stories that seem impossible, you will find that the majority begins with the hope and belief that any illness can be cured, along with the internalization that active action is critical. (Passive strategy usually does not bring recovery from chronic diseases.)