I have noticed that when a child gets sick
One thing I have noticed over my years of raising my children. When they got sick they would get rather whiny in behavior which is something I think many children do. I would persue getting a diagnoses for him for this stuff could be progressing and making him worse. Giving him Gabapentin and no other treatment is only easing the nerve damage pain and not healing what is going on with him. Not sure what hospital you too him too either but I would be taking him to an MDA Clinic with top notch specialist to see if they can figure out what is happening! I will keep your son in my prayers and hope all goes well with him. Many childhood diseases including heriditary ones can cause small fiber neuropathy! Some treatable and some not! Good luck and God Bless!