Can you resue your company for an injury?:
diabetes is a condition that is built up over time. you can't sue your company for a condition that you may have been prone to get due to poor health, eating habits or just outright laziness.

removing your pituitary gland will not cause you to get diabetes. You probably had diabetes but never knew it until they did the operation to remove your gland.

Sorry, but the company is only responsible for an injury you sustained while on the job and if you leave your job, your next job should provide you health coverage.