Thanks Guys, will get onto the water asap. The Dr I saw was not my usual one, and wasn't really all that interested in anything much I had to say or ask, so I was left with lots of unanswered questions! (I won't be going back to him again.)
That might explain why I have had massive headaches all week (I don't normally get them at all).
Well, hopefully these AB's kick in soon. Thanks for the advice, much appreciated!