(((((((Grey)))))))
I am sorry to hear that you are not feeling so well. I myself am on Neurontin. The dose of 200mg is really small and yes it will for the first few days or even a week make you feel kinda like you are walking on air. It is an unusual feeling. As far as the other things you are feeling, I think you should call your Pdoc. It is not good to stop any P-meds cold turkey. You should slowly reduce your dosage. This may be what is causing your feelings.
Oh and by the way the neurontin works wonders!
I am thinking about you and hope you begin to feel better.