I agree about calling your doctor to see if he/she can rx you something. I agree the neurontin is low though I know for me it was important to not increase too fast. Some people need 3500 a day I think for pain relief.
I am glad you are getting an mri. Do you think for now till at least you get more testing you could not lift your kids? I know it is probably hard not to but at least till you know what is going on. I hope you are feeling better