Does Illness Make Your Personality change?

Yes it does because it changes your daily routine

Children with chronic diseases get eyes that look like adult eyes. Perhaps suffering increases their inner age.

Most times I get frustrated because there are so many things I cannot do, which in turn makes me snappish. Otherwise, I just don't care, which translates accordingly.

mental illness maybe

Bingo. No maybe about it.

The other way around, your personality creates an illness...you came out the otherside healthy and strong..you did well.

The word disease can be broken into two parts dis and ease.

Im sure you have heard it all before

Yes there are studies done that over time , people living with chronic pain , their whole brain makeup changes for the worse. So when they refuse you pain medication, you can ask to be referred to a pain clinic who will treat you.

Changes.

If your feeling sick all the time you will eventually feel down and not as optimistic as usual..
If you have been feeling sick and all of a sudden get better you will most likely feel like you have a energy burst because your not sick any more lol therefore feeling happy and being more easy to be around.. if you were REALLY REALLY sick with something terminal then yes your personality will change due to stress.. peoples personality's change with how they feel about themselves and their surroundings usually :P