Firstly, my apologies as this is probably a stupid question but there we go!
Last Mon I went to my GP having suffered over the weekend with aching around the kidney area which then spread into my sides. GP gave a week long antibiotic which I have taken (and now finished).
Over the week, I have at times felt very sick and been sick maybe two or three times.
The pain I was having had eased a lot but I can still feel a couple of minor twinges. Got up this morning feeling very sick again and sweating buckets (sorry tmi! )I have come to work and still feel absolutely baking 
I am otherwise healthy.
Wwyd - can't decide whether to ring again or wait a day or so. I don't want to mither and take up time unnecessarily but I would have thought I would feel better by now?