I know your story well, dpdx. We've spoken many times and it always saddens me to hear what this condition does to people's lives.
What I'm saying is that you were already chronically stressed, and then to add to that, you had a test done which also made you extremely stressed on top of that. The noise may have been secondary, and you may still be fine. There's a very real chance that you are so fixated with your tinnitus that your stress feedback loop is just out of control. The moment that noise was played was probably the straw that broke the camals back.
It can be very hard to differentiate between a feedback loop of chronic stress, and actual physical damage. Although prolonged stress in and of itself can also damage the auditory system.
This is what makes tinnitus such a difficult thing to pin down. There are just too many ways of acquiring it or making it worse.