It is totally within your rights to seek a second opinion. I did for my neuropathy and while it didn't change anything, I felt better having a second neurologist on my case.

I'm not a doctor, but three weeks after an accident is the exact timeline I see with my auto-immune attacks. It takes my body about three weeks after a major accident or surgery to produce the anti-bodies that attack my nerve endings. As I'm learning, neuropathy is incredibly complex and the underlying condition is likely different between us, so just take this an anecdote.

I also have a great career I wasn't willing to leave and looked into paying the out of pocket costs for IVIG treatments. In my case it would have been nearly six figures for the treatment and upon advice from my neurologist I'm waiting until my condition gets worse before taking that measure. If it makes you feel better, I asked a similar question on this board