Hi Sham0968.
Sorry to hear you are not well and are waiting for a diagnosis. Many here have had an initially negative MRI. This is why it is important to see your Neuro over time so s/he can see any changes.
You might also want to keep a symptom journal and write down your questions.
As to the gabapentin (Neurontin)- ask if there is an alternative that doesn't cause weight gain. Don't stop it suddenly- taper if you must but please do this w your docs approval.
Sorry it took so long to get a response here. It has been very quiet lately.
ANN