relief for Bloating, constipation, weight gain

I have been taking Neurontin for 1 week (300 mg 1x per day and then prescribed to increase to 300 mg 2x per day after 1st week). It has been incredible taking the pain away (hemi-vertibrae bone defect in neck with severe arthritis)!!! Like Oh my goodness wonderful!!! however - by the end of the day - i am 20 lbs bloated and feel like the weight gain is right around the corner... I am very aware of body ( I am a dancer) and need to know if this is going to balance out...Thank you:)