Oh I do sympathise, it is hell on earth. I've posted lots about my battle with thrush so if you'll forgive me here is a cpoied and pasted bit of advice I've given before on this thread.
I had hell with thrush and it's only just gone in the past couple of weeks. My case is not normal but I thought I'd tell it anyway, if nothing else it should make you feel better in an 'always someone worse off than you' sort of way!
Great tips here from everyone- I had the same symptoms as well, plus DS eventually got white patches in his mouth. I also got a deep crack (from poor attachment) that did not heal for weeks and weeks due to the presence of thrush.
Because I was unsure it was thrush (most pain in bf is due to positioning and attachment issues) I left it FAR too late and it took absolutely forever and ever to get rid of.
Again, I must state I think I've been extremely unusual but I had three courses of the meds you have been prescribed, and during the last course I cut out sugar, (so no fruit either, just veg) white foods (pasta, rice, bread) all yeasts, alcohol, dairy except tons of live sugar free bio yoghurt, etc.
I took grapefruitseed extract tablets, acidophillus tablets, garlic tablets and used grapefruitseed extract liquid as a nipple wash and mouth swab for DS. I used my Silverette silver nipple shields (I used these to get rid of the crack in the early days) to try and create an environment in which the candida couldn't thrive.
I washed everything at high temp, changed towels, bras etc constantly. It was hellish. Eventually I went on a long holiday to visit my parents abroad and the total change in diet (tried to stay sugar free but eventually failed!), the heat, different breast pads (no plastic back or puffy-up gel stuff like most uk ones) and swimming in the sea every day finally did the trick.
My DS is 24 weeks by the way!
It was truly awful in the first weeks (I was on a long thread with other sufferers, including KiwiPanda here) and although the drugs helped a bit they didn't get rid of it.
I hope my story doesn't terrify you too much- I get vaginal thrush all the time, so am very prone to it (and had a horrific bout of vaginal thrush postnatally too) had been on antibiotics postnatally and left it way, way too long. You have caught it early, have the right treatment and fluconazole usually works for most. You do need to be persistent though. Best of luck!
My DS is now nearly 7 months and and the thrush is still at bay, so it is possible!!
HTH and sorry for the length x