Overdose

Putting this here for reference.  Because I've had an intolerance to MSG/aspartame/glutamate for years and this is the second time I've been caught out in the last few months.  Note for anyone finding this via Google: these are my symptoms; others' may vary.

Classic MSG symptom: extreme skin soreness, especially on upper arms.  Oversensitive teeth.

Classic glutamate toxicity: flushing (to the point of feeling like sunburn), headache, palpitations, throbbing teeth.

It now appears there may be other glutamate toxicity symptoms: pins and needles, muscle twitches, potentially visual disturbances.

Treatment: orange juice (contains high free glutamate but other chemicals in there protect against it), Andrews salts, Epsom salts.  Epsom salts are said to be the most effective treatment.  Also taurine (Red Bull) but as that can cause health problems I don't fancy trying it.

Testing Epsom salts today - the muscle twitches have stopped and the palpitations seem much reduced.

Have previously tried orange juice and Andrews salts, that took a 2-3 day attack down to 3 hours.

Possible natural causes: do NOT eat these multiple days running, or in combination:

Cheese
Mushrooms
Slow-cooked (or repeatedly re-heated) red meat - think a pot of chilli, for example
Grapes
Tomatoes
Peas
Nori (the seaweed covering on sushi rolls)