Not sure if it helps (or is even relevant to your situation) but I was using Canesten and it did nothing so (under the advice of my GP) switched to Nilstat and it worked much better. Also, know it sounds really strange but my thrush symptoms were SO much worse when I had an iron deficiency. I was put on FGF (folate + iron) and have not had a recurrence. Hope this helps - was worth sharing just in case!
Take care and all the best.
Lily