regarding the ringing in the ear, I got it from a gunshot 6months back, and is there a link between noise induceed tinnitis and vertigo? can you damage the balance organs with a gunshot?
There is a very strong link between tinnitus and balance issues with people who have TJMD issues. I can't say if this relates to your gun-shot though. It strikes me as pretty odd to get permanent damage from one shot... I would've thought that you'd get temporary tinnitus that'd go after a few days?
My advice to you is to go for an MRI. You can get one for £250 in London - small change when you consider how many potential issues it can illuminate / rule out.
BTW- Tinnitus can be triggered by blocked E-Tubes.