It sounds a bit odd that it's just one leg (correct me if I'm wrong). If a medication was causing muscle pain, one would think (logically) that it would be more then just one muscle, on one leg. Was it the same leg involved with the Micardis? Have you ever had muscle pain in the leg at any other time?

It can take time for the body to adjust to new medications. I wonder if it will resolve on it's own in time.

I have NEVER heard of Neurontin addiction before. The drug, however, does require to be carefully tapered when stopping because of withdrawal syndrome...but that doesn't mean it's "addictive". Your body may become dependent (why it needs a taper), but that is not the same as addictive. MANY drugs have to be carefully (and slowly) tapered to avoid withdrawal syndrome (Neurontin, Lyrica, Cymbalta, ALL steroids, and many cardiac meds, etc, etc)...and this is just a very small portion.

Which brings me to my next point. If you find that you cannot continue the Neurontin due to this muscle pain, you MUST NOT just stop this medication. You will need to call her for specific instructions on an appropriate taper for you. So be careful, with the sudden stopping of daytime (or other) doses as well.

Hopefully your muscle ache will subside soon. Have you tried a cold pack or even heat for a short time to see if either help alleviate the pain. I'd be careful with the heat with your nerve issues, but a short trial just on your thigh should be ok.