One homeopathic idea to consider for shingles and other forms of nerve pain is hypericum/st. johns wort
https://shop.boironusa.com/medicine/hypericum-perforatum/?attribute_pa_dilution=30c&gclid=EAIaIQobChMIyZuqyYnR4QIVVlmGCh2pigQVEAQYASABEgKtXvD_BwE
I have personally used it for nerve pain...