I have had lots of scans sibce treatment...my back and shoulders which both turned out to be injury or degenerative changes. But we are always scared it ciukd be something more and it's best not to ignore as not knowing is just as stressful.
I had sone tinnitus issues post chemo with dizziness which was low blood pressure it turned out related to some cardiac issues. Start with the scan and then go on from there to sort it out.
Of course inner ear infection and sinus issues go together and both cause headaches, dizziness, tinnutus and headaches.