Has anyone tried a topical compounded cream that includes these ingredients: ketamine 10%, amitryptiline 5% and lidocaine 5%?

I am picking this script from the compounding pharmacy tomorrow. I saw it mentioned in an 11/8/2018 you tube video by Gil Yosipovitch, MD, who is known to be the "itch guru doc". I also noticed that he wrote a book a few years back with the Hopkins "itch doc", Shawn Kwatra, MD. I just had an appointment at the Hopkins Dermatology Center. They also want me to try the Gabapentin but that drug makes me concerned.

Seems it is all so much trial and error, because nobody really knows the etiology and there are so many different reasons why the itching happens to people.