NanKate, I did the test last autumn and it was clear
which was a relief, as I'd been having those symptoms occasionally for a while. As I said, I had visited the GP a year ago about it and she wasn't worried.
I have now plucked up courage to ask my brother - he's a consultant. He is convinced that it's piles - apparently it's a family thing, which I didn't realise (but then people don't tend to talk much about piles!)
I would always do any test offered - it's too important not to. I feel much calmer now and it makes a lot of sense. However, I will keep a note of the symptoms and if they don't ease, or they get any worse, I'll go and see my GP again.
Thanks to all for the replies. I'm feeling a bit anxious at the moment anyway, and it doesn't take much for me to go into a tailspin!
I didn't know you could pay to do the test privately, NanKate - how do you go about that? That's something I might well consider.