don;t panic too much about her period. It may be related, but DD1 started hers last january and then didn;t have another one until april. very common according to the docs as I took her in about them as DD1 was worried to that something was dreadfully wrong.
in fact, DD1 also was having panic attacks this time last year and was also having weight issues......her was fear over the car accident, but once she voiced the fears to the doctor, and the doctor said it was actually very normal to have fears like that, and that more people than she would ever meet have fears, then DD1 relaxed about it. It kind of broke the 'spell' being held over her IYGWIM.
she was referred to a teenage councilor (sp?), which in fact (and to my shock) turned out to be a social worker, but I have to say it couldn;t have worked out better. for my DD, just knowing that it was ok to feel like that, that she wasn;t going mad, and she wasn;t going to die (another big fear), made her calm enough to start getting better on her own. by the time we met the councilor she was pretty much back to the DD we know and love.
you are doing exactly the right things