Im no expert either but I have learnt that P/N can be rapid if its toxic. You may have multiple causes. In the last few months have you been exposed to anything new? below is cut n paste google

Causes
Drug abuse and chemical exposure in the workplace are the most common causes of toxic neuropathy. Exposure to lead, mercury, arsenic and thailum in the workplace makes you more vulnerable to toxic neuropathy. In addition to drug abuse, sniffing substances like glue can lead to toxic neuropathy. Herbal medicine remedies, especially Chinese remedies, can be another cause of toxic neuropathy because herbal medicines can contain dangerous chemicals.