Welcome to NeuroTalk:

We had a member here who developed a reaction to a pelvic treatment involving an acid injection...

http://neurotalk.psychcentral.com/post892849-7.html

Her posts evolved here to become a diagnosis of Reflex Sympathetic Dystrophy, or CRPS. She went to our RSD forum here and discussed her pain issues and finally got a pain pump.
I have noticed she hasn't posted recently, and I don't know why.

But if you search her in member's list, and read her posts, you might want to explore RSD diagnosis as it may apply to you.

Also "nerve injury" is listed on internet sites for your agent (aethoxysclerol). Peripheral nerves do sometimes grow back after a sclerosis agent is applied. But that takes time.
Ablating a nerve with a chemical is done in a condition called Meraglia Paresthetica, in the upper thigh and that nerve can grow back, (the lateral femoral nerve), sometimes with painful consequences.

But yes, the release of the peptides from the neurons' cell walls has been implacated, in causing a diffuse full body reaction.
But RSD also does this and is called full body RSD, involving the sympathetic nervous system.