Thank you for your response, Kate. I can see now that I came off too quickly but there's no going back. It's been four days since I quit and I feel just as bad. The only thing that makes me feel marginally better is fresh air. Unfortunately, between the heavy downpours and my work deadlines, I haven't had much opportunity to potter around the garden.
All the PUK nurse had to say via email was speak with my GP, which wasn't at all helpful.
I have a feeling my neuro nurse is on holiday at the moment (school half-term break) so perhaps I'll hear from her the beginning of next week.
So I will soldier on at home until I can face the prospect of discussing my situation with "a professional" over the phone. It sounds silly, I know, but I don't like phoning people at the best of times. To be honest, just posting on the forum and getting input has been a help. Bless you.