Thank you so much for all of your comments, very much appreciated.
Yes, I know two women (sisters actually) who both had menopause babies in their early fifties but thankfully there is absolutely no chance whatsoever that I am pregnant.
Yes, it's horrible when you don't know when to expect your next period Gillybob. This one came when I was away from home and didn't happen to have any "supplies" on me at the time.
I have an appointment with the GP next week anyway for a repeat prescription so I will mention what is going on, hopefully it will be down to the menopause although it has been fairly trouble free so far.