Since I am not able to access clinical extended high frequency audiograms up to 16kHz, I can only guess that my tinnitus plus ear fullness (verified no physical blockage, wax, nor fluid) is due to damage of the synapses that are attached to high frequency detecting hair cells near the base of the cochlea, but possibly not hair cell death since I can still hear up to 17kHz at my age of 30:
https://www.audiocheck.net/audiotests_frequencycheckhigh.php
I'm very responsible with noise exposure in my life and my tinnitus was caused by an ototoxic antibiotic which I don't know if if affected the synapses or hair cells.
If it becomes available, could I still take both treatments at the same time and have no adverse effects and possibly a slight improvement beyond 16kHz? I would prefer that for best results because again, nowhere in my area tests hearing up to 16kHz and and I'm a little concerned that under-educated clinicians would say my hearing is fine when they only test up to 8kHz.