It sounds as if your symptoms are making your life unmanageable, and all you are given is Mobic, an nsaid with a bad side effect profile,
and Neurontin? For
MS, nsaids rarely work, except to help with pain caused only secondarily. For instance, if you favor one leg, the other may get overworked, with sore muscles or worse symptoms, but there's nothing really happening with it that helping the ailing leg wouldn't fix. As to the Neurontin, very possibly your dosage isn't high enough.