Oh no James, you've been doing so well, but compensation/healing from VM/inner ear injury doesn't progress linearly. You're so getting there! Hopefully the diet and diuretics will help keep you on track!
I'm following your progress and theories with great interest, and I agree with you it can't all primarily be caused by a wonky migraine brain 24/7! Don't buy it either!
I'm due to start reducing Pizotifen 2.5mg from January, bar no major relapses. Dr S said it'd be a reduction of 0.5mg per month! Fingers crossed I'll get there too. My tinnitus has reduced too, after nearly 2.5 years of this rubbish!
Good luck with the ENT appointment.