I applied for social security disability following my surgery, and was approved. I did it on my own. It took six months. It was easy to do. The problem is, you have to be really disabled. I worked on ladders. Not a good idea following AN surgery. I was 61 when I applied. I had a stroke one year prior to my surgery. Social security sends you to their doctors. I had two doctor visits, and one to a psychiatrist. Social security got statements from my AN doctor, my stroke doctor, my speech therapist, and my physical therapist. It did not cost me any money. All you have to do is fill out the paper work. A letter from your doctor will not do you any good. Social security has their forms, and all you do is supply your doctors information. It is out of your hands.
If you are capable of doing some other type of work other than what you do right now, you probably will not be approved. If you are approved, your income will be limited...based on some formula of your previous earnings. IT IS NOT ENOUGH TO LIVE ON!!!!!! You can get a part time job, but cannot earn over $1000 per month. If you go back to work, it should not have any impact on your application. It might even help...if you cannot do the work, then that is some proof that you are disabled...but believe me, it takes a lot more than that to get approved. It is really out of your hands. They really check your facts, and this is what they do for a living.
When you return to work, you will know if you can perform. Stress is part of all jobs, and probably will not be a factor in your application. I don't know when you had your surgery, but recovery is a slow process. Give it some time. I am sure your supervisor will be understanding. I wish you well in your recovery.
James