Thank you all for your support, you truly are a lovely bunch. I've had my MRI now (very noisy!) and they are having a meeting tomorrow to discuss my case (among others) and then they will ring me with a proper diagnosis and a plan. I can't help feeling a little scared, but will remain positive until I know if I have something to be scared about.
I can't thank you all enough for your encouraging words, I was beginning to feel very lonely, but not any more.