Thanks again everyone, for your support and advice. I agree, it is great to be able to air worries on forums like this, rather than burden/bore family and friends, or keep it quiet and have them wonder why you're being grumpy or a bit distant.
I saw the doctor today (managed to get an earlier appointment with my preferred doctor as I have a nasty bacterial infection in my eyes - sooo painful and hag-looking). I'm completely confused by the GPs booking system as last week I was assured that Thursday would be the earliest I could see him, and even then it was because they were doing me a favour!! This morning, they tried to palm me off on a locum, and all I had to say was "Oh, I don't know that doctor," when BINGO, I was offered the doctor and time I wanted.
Lesson learned: be a bit more assertive.
Anyway, I have been referred to the local gynae department, and should have an appointment in 2 weeks. The bleeding stopped after a couple of days, and I'm feeling a lot more positive (especially as I have something else to moan about!!).