How bad can peripheral neuropathy get? Not diabetic.. .

Depends. It depends on the cause. Neuropathy may result in ulcers, infections, joint damage and related complications that my necessitate amputation.
You may visit this site for more info: https://www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Peripheral-Neuropathy-Fact-Sheet.