Yeah it's a bit over my head too, but if I'm not completely mistaken I think the point there is that stress could cause tinnitus on its own... via three different possible means. Or at the very least exacerbate existing tinnitus.
You are not the first one to report tinnitus after or during a period of anxiety etc, and I've seen that happen to people with no apparent tinnitus before. It's not unheard of for the tinnitus to go away after the stressor is no more there. You might get lucky, hopefully so!
Just speaks to the complexity of hearing/nervous system, though...
Basically if someone who has noise induced tinnitus... or tinnitus caused by anything really... gets stressed, anxious, and all that, tinnitus can and often becomes more of a problem, but the interesting (and sad if so) part is that if I comprehended correctly, the stress might cause permanent tinnitus...("overdrive in the HPA system in cochlea are so far unknown")
A vicious cycle... first "normal" tinnitus due to something, then becoming stressed about it -> which in turn might cause a permanent increase, and oh.
Based on anecdotal experiences though, I'd say stress causing a permanent increase is very rare. Also often tinnitus that stress brought on goes away on its own in due time. That is purely based on what I've myself spotted on the web over the years, people telling their stories.
But Louise's tip about having a hearing test done is more than valid, do it and as she suggested, ask for one that tests frequencies over 8kHz too. And yes, don't trust the audiologist's "your hearing is normal", ask that they print the results and give them to you on paper...
Report back once you know more!
Markku