I didn't see the answer if my question..how can I...

You can submit a warning notification to the employer of your wish to terminate the work contract due to your health conditions which prevent you from proceeding your work with him and request a cancellation of work visa or request a transfer of your sponsorship to another sponsor with whom you can continue working in accordance with your health conditions
You can also submit a request to the labor office with whose knowledge you have been recruited and submit a request to cancel the work contract drawn up between you and the employer due to your health conditions, especially since three years have passed to work with the employer without any problems.