Hi Groundhog
Tinnitus and a degree of left side hearing loss was one of my first peri sympyoms back in 2012
ENT diagnosed the slight hearing loss and ordered a MRI, nothing could be found and I didn't ask what he was looking for but he discharged me saying it's consistent with a head injury (I hadn't had a head injury)
Tinnitus remains to this day, all sorts of sounds too, if it's mild you can in time learn to ignore it but a month or 2 ago I woke up with really loud drumming, fortunately it only lasted a few days but was sending me insane
Please go for your MRI, it's been offered and might give the answer to your tinnitus
Annie x