Does anybody have any experience of UTIs? I have had what I thought was a stomach bug with headache and nausea for a few days now. These symptoms seem to be easing off but my bladder feels as though it is never empty and I can't stop going to the loo. There is no burning and no pain, just very slight discomfort. I was under the impression that if you had a UTI you would know about it - has anybody else had this?