Yeah Neenie, it sounds like your "perception" changed for sure...however, I think I would say that there is definitely a "volume" issue with tinnitus, not just "perception".
I mean I have had three jump ups in volume after initial level so I have a bit of experience with this. The last jump up took place in such a subtle way that I have no idea how "perception" could be involved.
For one, I did not know it was happening when it was happening, so how could brain-perception aspects be firing that up?
Secondly, I was the opposite of stressed. I was feeling great and doing something I loved. (Hassling corporate bullies in a meeting...politely!).
Three, the volume level increase was a total surprise to me and I plain did not believe it for a few days. So some sort of "mental conditioning" seems unlikely.
Four, objectively it is louder. I can remember with each level of volume increase where I could hear my ringing and where I could not...First it was just in a very quiet room; then even with a bit of background noise; then all the time but not when there was constant loud background noise (like traffic, or a creek flowing, or music, etc.); then all the time above everything.
These levels remained objectively constant no matter what my mood or 'perception' of it was. Sure, when I was adapted or preoccupied, etc. (First three volume levels, still struggling with this fourth one) I would not 'hear" my tinnitus, but that was the brain perception part. If I stopped and objectively-subjectively did a volume test on myself...like in a quiet room, or stuck my fingers in my ears in a quite place, etc. the volume was where it was for that level, no matter what I thought about it.
I am not saying here that tinnitus is not a "brain thing" as for sure it is. But I am saying tinnitus "volume" is a reality.
Best, Zimichael