Hi Becky,  I agree with Cassy, antidepressants would be far less harmful than large doses of pred and you may only need them for a few months, just to get you feeling better.  I believe you are under the same consultant as me at the Middlesex Hospital in London.  Have you explained to him exactly how you feel?  As a multidisciplinary clinic, there is an excellent psychologist attached to his team, who you could arrange to see on the same day as the endocrinologist - if you ask.  She understands CAH well and is a lovely lady - it may just be worth you having a chat with her!  We all get down sometimes, and why not take advantage of the help on offer?  Good luck and I wish you well!