OUCH! I used to get a dull ache in the bottom and vagina when my period was due so it may well be hormones causing your symptoms.
When I had thrush after stopping the contraceptive Pill it was so high up that I was unable to reach to scratch
and of course, the Gynae Registrar said 'no scratching I know it's difficult, but no scratching'. I was given a pessary but can't remember what it was.
I also had thrush after emergency surgery so if I have to go into hospital with plenty of warning, I eat lots of LIVE yoghurt to keep the digestive tract 'clean' of candida.