Oh my goodness, never dreamed of doing a patch test. How awful for you!
Can GP let you use the Estriol cream more often if you need a little extra??
I use twice a week, but have added a half dose a couple of days in a row before I was due to do a long ride (I ride a motorbike to work each day and was getting very uncomfortable). I had to drive in the summer as I was unable to ride for more than an hour due to soreness outside and internally. I had a 5-6 hour ride to a Rally on holiday. I was so upset.
Maybe use Estriol cream every 2-3 days or ask about Vagifem as many ladies seem to use it every day. Estriol cream a bit messy but, for me, is doing the job ok, so don't want to change.
When I was with GP and I said 4 days was too long, he said use every 3 days. But now settled into using day after patch change and seems good.