...I am so sorry. I know exactly how difficult it is. The itching and burning really do take a toll. It can be hard to know when to stop treatment, and I advise you to keep in close contact with your doctor over the next month. From my experience, I have learned that it's time to stop when your skin reaches the erosion phase. Erosion may come before the prescribed ending of your treatment period. That's been the case for me more than once.
I am including a few articles that may come in handy over the next month.
This one contains tips for using the cream: https://skincancer.net/life-with-skin-cancer/tips-for-efudex-users
This article will help you understand a little better about when to know the treatment is done: https://skincancer.net/life-with-skin-cancer/efudex-cream-how-long
When you reach the erosion phase and/or your doctor gives the signal to stop treatment, you will enter the healing phase. This article gives tips on how to handle healing. It's a welcome phase, but it can also be very challenging for the first few days.
https://skincancer.net/life-with-skin-cancer/efudex-side-effects-tips
Please know this community is always here for you. I am sending you lots of positive vibes for a smooth treatment with few side effects and great results!
April, SkinCancer.net, Moderator