Detect Nerve damage

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Hi Folks

Glad i joined this wonderful forum. I have been reading and sobbing on people stories. I had a bad slip fall that send me to ER where a sacrum hematoma was detected on MRI. But no disc herniations or broken bones. 6 months later, i had severe nerve pain on side of foot and sole numbness. Diagonosed with neuropathy. Took gabapentin for 3 months and currently take R-ALA, biotion, etc.. Now, i am having nerve pain, hips, inner groin, piriformis spasms and right foot sole still numbing. I hear nerve pain is hard to diagnosed even with EMG.
I am set for an EMG on my back (S1) tomorrow. I am scared that it will replicate or make the problems worst. Ortho thinks is the S1 compression, damage..
Has anyone able to detect Nerve damage or inflammation via MRN (maganetic resonance neurography). Will insurance pay for this?
I plan on getting a new MRI or CT. i figure CT will catch any tumors that MRI didnt catch last year.

thanks