Getting good rest and relaxation is very important for those with chronic conditions as it allows your body to recuperate and your mind to heal. Resting while scrutinising the day is counterproductive, and that is why using visualisation techniques, breathing exercises, meditation or mindfulness can be helpful, but do your own research and work out what is best for you. Often complimentary medicine such as rest techniques are a useful way to help quiet the mind and rest the body and any additional benefit you get from the practice is a bonus.
There are many articles and mobile apps that you could use, below are a few useful techniques with links to websites. It might also be wise to talk to your health professional.
Visualisation techniques have been found to be helpful in reducing stress. Thinking about something relaxing could help with feeling more relaxed.