I am taking 600mg/night of Neurontin for insomnia - been taking it for 1 month now. The next day after I took it, I noticed stomach irritation (my lips get weirdly chapped when my stomach is irritated). I started taking it with food and that seemed to help the irritation a little, but I still have nasty acid reflux and constipation as well. Anyone else have similar experience to this from Neurontin?