I Have Had Severe Nerve Pain In My Right Upper

I have had severe nerve pain in my right upper leg. It hurts with anything touching it including air from a fan. It’s been going on for 6 weeks. I was told it was shingles but, I never got a rash. It burns and feels like lightning going on in my leg. I couldn’t take the meds for shingles because of my liver disease. I was told to just up my gabapentin. It hasn’t helped.