It felt like it had scalded my nerves. I have had Fibromyalgia 22 Yrs and I’ve read that everyone with it has food and chemical sensitivities. That includes food additives, certain foods, injections, creams and inhalants. So that would be why ppl like me have blogged that lidocaine injections hurt the nerves permanently, esp in winter. Lidocaine may not bother your pain level if u are not sensitive to it.