i don't have any advice, but i do really feel for you - it must be such hard work and really draining and upsetting.
have you considered seeing a homeopath? i had thrush in the nipple and breast when i was breastfeeding and daktacort did nothing for me at all. they also gave me some hydrocortisone cream which also did nothing. i ended up in agony with thrush and gave up breastfeeding.
if it helps here's a link to homeopathy site homeopathy which may be of some use
good luck, i hope the thrush goes away soon.