CB I hope the gabapentin works for you and you get some relief.
As for sticking your finger where the sun don't shine 🌞 , your GP will be checking for Claudia Equina, and tingling in the legs and feet will be just one of the symptoms that will be making her cautious. ( Good doctor) .....After my last back surgery I woke up with partial cauda equina in my saddle area, and still have it.......So please if you get any numbness around there, do something about it quickly.
As for using some inheritance money, don't feel one tiny bit guilty.....it's yours.