I have. From one hospital stay. Of course, I wasn't stable enough at the time to do it, but did it anyway. Wasn't such a good idea. I couldn't and didn't handle it very well. I had not given myself enough time to digest all that was happening at the time - just out of hospital, newly diagnosed with mental illness (depression, initially), etc. My doctor did warn me ahead of time...
It was not the diagnosis so much as reading a totally objective view of my behaviours, thinking patterns, etc. Since I was not yet truly aware of my behaviours, I was appalled at what/how my doctors thought about me. Of course, I took it very personally, denied it, and blew it off.
Needless to say, it slowed my recovery - I did not return to counselling for 2 years (and was completely f***** by that point).
I am in a place now that I will be requesting my file from a therapist that I saw for 5+ years. During that time, I never once asked him what he thought my diagnosis was. It was when it came time to part ways (he retired) that I asked for his opinion. By delaying my desire to know what was wrong with me, I think I allowed myself to be as real as possible (without preconceived ideas that I fit into any one category which could have/would have altered my behaviours), which, in turn, allowed him time to properly diagnose my illness. That is when I found out that my patterns fit neatly into a BPD diagnosis - and I agreed, because it finally felt like the right one this time.
The rush we feel to be put into the right category, may at times, rush the therapist to provide some sort of answer, even if they may not yet have all the facts. (For instance, depression was always the number one diagnosis for me, but no drug therapy or talk therapy helped. Depression was NOT my main illness - only one of the many symptoms experienced by borderlines). There was no way a therapist could have diagnosed BPD without extensive analysis of my current behavioural patterns and my background.
Now I treat the borderline symptoms, and don't worry so much about the depression part, because I have been able to identify that my depression comes only when I am having difficulty with BPD symptoms.
If I are new to therapy, I would wait awhile. If you are already unstable (not saying you are - don't know you...) or even feeling anxious or depressed, I would again, wait until you are more confident about yourself.
Oh, but the curiosity....
Altered State