...I am so sorry you are dealing with squamous cell carcinoma. I know exactly how stressful that can be. I know you must be frustrated about the side effects you are experiencing from your medication.
I can completely understand your apprehension about using Efudex. It can be a very difficult medication. Has your doctor suggested spot-treating with Efudex? I have done that several times, and the side effects are much milder when you treat smaller areas instead of covering a large area.
There are other treatments that aren't as harsh. One of them is called photodynamic therapy (PDT), or blue light treatment. I have known a few people who have tried it and prefer it over Efudex. The side effects are much easier to cope with and the treatment time is much shorter than with chemotherapy creams like Efudex. It might be worth asking your doctor to see if this is an option for you.
I am including an article on PDT you might find helpful.
https://skincancer.net/treatment/procedures-surgery/photodynamic-therapy
I am also including an article on the different types of chemotherapy. There are several different options depending upon your needs.
https://skincancer.net/treatment/chemotherapy
I hope you are able to find a treatment that is effective and has few side effects. I completely understand the struggle. Please don't hesitate to reach out to us any time. I am keeping you in my thoughts!
April, SkinCancer.net, Moderator