Nerve damage from .5cc Juvederm Voluma dermal filler in left cheek. What's the average healing time?

I had this procedure 7 months ago. My surgeon was struggling to get the product in & pushed through. She used a cannula. I have been diagnosed with 2nd division Painful Post Traumatic Trigeminal Neuropathy (PPTTN) by a Neurologist. At first I had just autonomic changes such as redness & swelling and then after 3 weeks I started to feel pain. I have now been in horrible constant daily pain that effects my cheek and eye. 1200mg daily neurontin no working :( Hope to see Pain Mgt Specialist soon.