SHINGLES looking for advice, in horrendous pain from shingles please help :((

Hoping for some advice here. I went to doctors today due to severe lower back pain and a rash where I was experiencing pain. I've read so much online that it seems to be the rash that bothers majority of people most but for me it is the unbearable back pain. It feels like lightning bolts shooting through me ever 10secs, I got an antiviral medication and am on 60mg codeine every 4 hrs and paracetamol for the pain which dont help one bit, has anyone else experienced it this bad before and I dont mean the rash it's not bothering me near as much as the nerve pain😥 any tips on how to ease the pain would be much appreciated as its severely affecting my daily life thank you xx