Lynnette...
I have to strongly agree with attheedgeofscience, that once one has had a bout of tinnitus that does not just go away like with 'normal'? people ("wow my ears are ringing" + laughter...then it goes away), then it is maybe a lifetime thing to be careful of, and avoid the insanely loud levels that are somehow legal at concerts, movies, "Cirque", theaters, etc. Let alone shooting ranges and stuff.
Sound seems to come in through the bones in the back of the head too as even with full earplugs and aircraft carrier grade military earmuffs, I would still get affected by plain road noise on a freeway...Ummm, maybe not a German autobahn as they are so smooth, but here in USA. The sound was hardly coming through my ears, but it sure got through somehow and made my tinnitus louder. It was hard for me to even believe. And it was not just "internal loop volume subjectivity" either.
However, the good news is, that even at that level of sensitivity and volume, I became pretty much "unaware" of my tinnitus over a period of four to five years. By six years I was able to tolerate pretty loud sound that I would not have thought anywhere near possible again. The key was to not expose for too long, and/or protect....And at a long event like "Cirque" concert I'm afraid that pushes the envelope too far for just plugs...even good ones.
It is often easy to forget "exposure time" and concentrate on "volume" of noise. That's what tripped me up even with all my years of tinnitus experience (and hyperacusis) where I should have known better. I was, and am, great at pre-predicting loud sounds just before they happen and mostly catch them with fingers in my ears, or the plugs are in, but that exposure time one is more tricky. With my recent jump up on 2012, the volume seemed not too bad (and way, way less than what you were at re Cirque) but it was a meeting that lasted many hours. I was totally unaware of it at the time until it was too late. I walked out of there with even louder ringing than my loud base rate (s0 yes, it can go up -permanently). I figured it would go down again to my usual loud baseline with a good night's sleep....It did not. I remained at a staggering loud level and has been the hardest for me to adapt to so far. Not there yet.
So...You are younger. Body heals faster. Probably more adaptable. You have 'only' had tinnitus for a short period of time (yeah I know that may sound insensitive), but really, it is highly, highly likely that in a few years from now you will be mostly unaware of it, and living a normal life. The statistics for that are just plain hard to deny, and I have "adapted" fully three times in my life even though obviously have a 'genetic'??? susceptibility to it. [Father, brother, me.]
However, that caveat...I would avoid things like Cirque for years. You will know when you are ready for something like that and will maybe even be OK with averagely decent plugs...Or the world will have woken up and sitting in auditoriums paying big money to get blasted with 115 decibels will become illegal. I'm not counting on that though, so it's up to you.
Hang in there, and TIME...is the great healer on this one. More than anything else I have tried, and I have tried a lot for it over the last 34 years. Depression, anxiety, etc, are also sort of par for the course in the rough patches. As the tinnitus improves the load is less and the whole basket gets lighter to carry.
Take gentle care, and good that the MRI's etc. are clean...means "time" can works it's subtle transition more freely.
Best, Zimichael.