CC,
The truth can be so freeing... I hope you will find it in you to share with your parents about your illness. If not in the beginning, I'm sure they will eventually be suportive. It's possible that they already have somewhat of an idea of what's been going on. Families tend to pe quite perseptive on these types of issues. They can also be a huge source of support for you.
My thoughts and prayers are with you.:ghug3