Buyout option related to health issues

I am suffering from sleeping issues and stress disorder due to psychological issues. I joined Capgemini may 2nd 2025. I already submitted all medical documents for early release to focus on my recovery of mental health issues. In the June 2025 , they won't provided weekoff for me. Now I am taking sleeping pills for my sleeping issues. I highlighted the same thing to manager and HR. Manager ready to release me from project . But HR asked for the medical documents for internal medical team validation. After reviewing it , HR told like early release was no possible. Till now my probation period not completed. Now can I buyout on my own? Whether it is possible. Kindly provide me a suggestion for it.