Stress can cause a lot of illness. One lady that I know, she was stressing out a lot and she now has under active thyroid and when you have that, then the rest of your body will go down hill. Loosing hearing, heart failure, lung failure, kidney failure, just to name a few.
Stress can cause diabeties and make it worst.
There are many ways to avoid stress, you can ask your doctor what you can do.