Never. I'm not allowed to have one because my doctor won't tell me all of my diagnosis'. I asked her last week and she revealed one and I asked about another that I had a hunch over and she confirmed that one too but, you should have seen the look in her eyes. She was visibly worried and holding back. Probably thought I would dwell on whatever the rest was and search it all day and night and obsess about it until I got upset and unstable.
I really don't get why it's so hard to get a damned diagnosis so, that you can know where you stand!