i know you 'should' go straight to the docs, but to be honest the last time i went to the doctors for actually almost exactly this, i wanted them to confirm it was thrush, my doctor didnt have a look or anything, she was just like ye try an over the counter (in fact she made me feel like i was wasting her time). there arent any commen stis which cause itching, and i specifically asked her whether the cream could be bad if it wasnt thrush and she said no.