Providing my story here as a data point for anyone that it might be useful to, as other people's anecdotes have been helpful to me over the past year as I decided what to do.
Background: I have had tinnitus since 2015 and, long story short, I appear to have some sort of condition where it gets worse semi-permanently (new sounds for months or years) if I get a viral infection (flu, cold, whatever). I suspect it's autoimmune.
In 2021, I was excited to get one of the initial COVID mRNA vaccines because I was concerned about what might happen to my tinnitus if I got COVID unvaxxed. However, exactly 6 days after my initial Moderna dose in April 2021, I experienced a severe worsening in my tinnitus, in much the same way that I do when I get sick. I was borderline suicidal (which didn't stop my primary care doctor from encouraging me to get my second shot, of course). After 5 months of wrangling with said doctor trying to find a solution or alternative, I got my second Moderna shot, and had the exact same tinnitus worsening 6 days after the shot. I handled it better, since I expected it to happen and had been prescribed anti-anxiety medications, but was put off mRNA for good.
Since then, I had been closely following the Novavax production and approval saga - while the mRNA vaccines reliably produced a bad reaction, I had continued receiving my annual flu shots with no negative effects. I hypothesized that my body would react to the Novavax vaccine more like the flu shot than the COVID shot, since both Novavax and Fluarix simply deliver the target antigen into the muscle, vs. having cells produce it and present it on their surfaces like mRNA — perhaps this was cuing my body to overreact? The unknown was whether Novavax's adjuvant would trigger the same overreaction, as Flurarix is unadjuvanted.
I finally got my first Novavax booster at the beginning of December 2022 and I am pleased to report that, a month later, there has been no worsening of my tinnitus or any other discernible side effects. If you're someone who suffered tinnitus issues with previous COVID shots (or if anything about my condition sounds familiar to you) I can't guarantee anything, but I can say that Novavax is worth your consideration.