Sorry for the tmi and for the general ignorance 
Since I woke up on saturday I've been very itchy around the entrance to my vagina and not weeing often. I was out drinking on Friday which will have dehydrated me and am terrible with drinking enough water generally, but even on saturday evening when I was out drinking again (though only a couple of drinks, don't judge me!
) I was still only doing small wees and I am clearly dehydrated. I thought I'd done fairly well with drinking enough water during the day but I guess not.
I've never had thrush before so no idea if it is or not. Could it be dehydration?
If I think I have thrush do I need to go to my GP? Or can I just go to boots pharmacy? If I use Canestan and it isn't thrush, will I just be wasting money rather than doing damage to myself iyswim? I just think getting a GP appointment this week is going to be damn near impossible, even ignoring work and everything else I have on!
TIA 