PARKINSONS, NEUROPATHY AND TRIGMINAL NEUROLOGIA

I have been diagnosed with all 3 of these within the past couple of years. I'm taking Gabapentin for the Neuropathy with increasing doses, Crexent for the Parkinsons and Tegretol for the TN. Any ideas of how they all started, if they can be successfully treated to slow down their progression? Especially the Neuropathy-only have extreme pain or extreme numbness.

Thanks