I understand when you say you have used a variety of creams and gels. Frustrating and expensive. I have a prescription pain cream. It is prepared by a compounding pharmacy. There are various “recipes” that your neurologist can request. It sounds like you need something to calm those nerves (Gabapentin, etc), numb the pain (lidocaine) and maybe reduce inflammation. I have a cream with three ingredients. $115 will last me six months or more. I only use it at night, on my hips, and occasionally during the day on a troublesome spot. If you haven’t tried that, you might. You can contact the pharmacy yourself, get the information on ingredients and price, then message your doctors office. They should be glad to help you.
It has to be a compounding pharmacy!