In this case, the forms are readily available. You must obtain a certificate from your employer and a self-certificate. Both forms need to be submitted to the ESI authorities to avail of the benefits. Additionally, you need to obtain a declaration from the medical board to proceed further. If you have a disability that prevents you from continuing your service, you must provide the relevant documents to your employer to obtain the certificates. If the disability occurred during your service, the process is certainly easier to navigate.
Best of luck.