Emma, I hope that your GP is able to help you. If he doesn't, then do ask again to see the neurologist. It would be far better to get that MRI and find out for sure what is going on, and treat it, rather than not know and worry everyone, especially your Mom, with what it might be. Doing an MRI really isn't all that bad. When I've had one done, I close my eyes and keep them closed until they wheel me back out after it's over.
Good luck with your doctor visit. I hope it will help solve the questions.