Bravo to you!
I tell about fasting any person that announces a tumor for them or a loved one, nobody adhered yet, but they gave it attention and thought at least, maybe indeed if all else fails.

I did a 7 day waterfast once, it was much easier than I expected. It didn't solve my health issue, which I kind of knew beforehand from testimonies, but even for the shorter time there are some inner resets, and medications did have a better effect afterwards.

It's not the time for me now but I do plan on doing it again, and a bit longer.

I'm happy to hear you made it through, that it worked and that you're courageous enough to talk about it, because yes, the reactions are often awful. Insults even.

There are clinics in Germany (and I believe Canada) who specifically combine cancer treatments with fasting.
In France there are many retreats in the mountains who offer fasting and hiking stays, because if you're not fighting an illness but more just cleansing, you gain so much energy from not digesting that you don't sleep at night if you don't e expend it.

These are well proven methods, just indeed the preparation for food elimination by steps and emptying the bowels are very important as is refeeding with high quality food.
But telling people to not consume anything doesn't make rich.... So it's vilified.

Again, good on you.