Hi Nylock
I feel your pain, I have been though what you are going through! My username might indicate that!
I lost my medical in very similar circumstances. It took me two years but I got it back. It cost quite a bit of money but it was worth it. In the end I was treated by a world renowned authority on vestibular matters! It all worked and I was eventually allowed back with a multi crew restriction.
I am quite busy but I will PM you some details. I would very much recommend seeing the professor I did. If anyone can save your job she can. If nothing else for a while I found the vertigo rather unpleasant and I was glad to be treated successfully.
I understand what you are going through. It was hell for me and for a while I was really down about it but I took the same approach as you and I worked and fought to get back and that kept me going!
I learnt quite a lot about it along the way so I will try and help you as much as I can but it sounds like you will know as much if not more!