Thank you both for your very quick responses. Yes, seeing my GP is more sensible, you're both right. I've only suspected it could be a thyroid problem since this morning. It came to me in my sleep, oddly enough. Just based on a couple of "symptoms" that I've noticed since last week. Nothing glaring but during the early hours it dawned on me that they could be signs of an OvTh. I'm going to see how things go this week and if I'm still not happy by Friday I'll call to make an appt. with my GP for the following week.
Cheers.