Sorry you are grieving your lost lifestyle. The fact you admit you are clinging to your former identity is a hopeful sign.

Reinventing ourselves is part of life. We change through all the stages of life. It is not easy but going with the flow is easier than clinging to a lifestyle we can no longer live.

I was active and went to yoga and exercise that fed my sense of vitality and adventure.
If interested and your doctor has approved you for exercise including yoga, check this out.