That's called an EMG....
I would suggest that there's more going on than just some sort of allergy. Do you have diabetes?? That's a common cause of neuropathy. I would recommend that you find a good neurologist and have them check you out. Were you in Texas, I have a dandy Neuro to recommend. You don't need a referral if you're on Tricare Standard.
I have the neuropathy and it's caused by that spinocerebellar ataxia I have, or so we think. It could also be caused and/or aggravated by the diabetes and the spinal cord injuries/ surgeries.
MSG also affects me pretty negatively. However, I wouldn't say that I'm allergic to it.
I don't know what it is about MSG. Sometimes I'm ok with it, other times, it's like I've been poisoned!
There used to be - may still be - a seasoning called "Praise Allah". It has a high level of MSG, and if I have it on something, it's a very bad thing. It's a flavor enhancer, and was used a lot by restaurants, particularly on meat (beef) as a tenderizer.
I had a chef tell me one time, that there are two types of MSG....a "real" type - I assume he meant natural, and a synthetic type....I didn't understand which one was the worst, but the bad one is the one in Praise Allah. He told me that a lot of people had problems with it, and their restaurants had quit using it.
Someone recently told me that "Tiger Salt" (?) is the same thing, just a different name....guess "Praise Allah" is not the best name, these days
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I can't say that I'm allergic to it either, but there are times that I've had it, that the effects have been so bad, I've contemplated going to the hospital, and I have passed out from the effects. Scary stuff. Used to be, the closer the incidents of having it, the worse the effects.