good video explaining MSG sensitivity:

Quoted from and he attributes his information from 

Many of us are suffering needlessly because of so-called safe food additives, namely excitatory neuro-transmitters (nicknamed excitotoxins). The main ones are monosodium glutamate (MSG), aspartame, and L-cysteine. You may think that you are actually avoiding MSG if you avoid Chinese restaurants, but this factory- created flavor enhancer is in almost every bottled, bagged, frozen, or canned processed food on supermarket shelves. But since MSG is often a component of a formulation, it is not labeled as such. (Editor's Note: Many people would be shocked to know that almost all restaurants use large amounts of MSG in their food preparation. Italian food is sometimes much worse than Chinese food.) You've seen words like autolyzed yeast, hydrolyzed protein, and whey protein. Each of these substances contain a percentage of glutamate, the harmful component of MSG. Are you suffering any of these symptoms? Perhaps you need to take a better look at the food you are eating. 

1. Severe headache 2. Nausea, diarrhea, vomiting 3. Irregular heartbeat or blood pressure, racing heart 4. Depression or mood change, bipolar, SAD 5. Abdominal pain, cramps, bloating, colitis, IBS 6. Balance problems, dizziness, or seizures, mini-strokes 7. Tenderness in localized areas, neck, back, etc. 8. Sleep disorders 9. Blurred vision or difficulty breathing 10. Chronic fatigue or sleepiness 11. Excessive perspiring or shuddering and chills 12. Shortness of breath, chest pains, asthma 13. Swelling, pain, or numbness of hands, feet, jaw 14. Pain in joints or bones 15. Flushing or tingling in face, chest, pressure behind eyes 16. Gagging reflex or difficulty swallowing 17. Hyperactivity, behavioral problems 18. Chronic post nasal drip 19. Skin rash, itching, hives 20. Bloated face, dark circles under strained eyes 21. Extreme thirst or dry mouth 22. Difficulty concentrating and poor memory 23. Slowed speech 24. Chronic bronchitis-like symptoms, allergy reactions, dry cough, hoarseness or sore throat 25. Heavy, weak feeling in arms and legs 2 6. Irritable bowel or colitis 27. Attention deficit disorder, anxiety attacks, rage, panic attacks 28. Neurological disorders such as Alzheimer's, fibromyalgia, MS, Parkinson's 29. Pressure behind eyes or on head, neck, shoulder 30. ADD, ADHD, Rage Disorder 31. Asthma 32. Weight problems, obesity, hypoglycemia 

Foods with these words on the label always contain MSG: MSG, monosodium glutamate, monopotassium glutamate, glutamate, glutamic acid, gelatin, calcium caseinate, hydrolyzed vegetable protein, textured protein, autolyzed plant protein, hydrolyzed plant protein, yeast extract, glutamate, yeast food or nutrient, sodium caseinate, autolyzed yeast Foods made with the following products often contain MSG: 
malted barley (flavor), barley malt, malt extract of flavoring, maltodextrin, caramel flavoring (coloring), stock, broth, bouillon, carrageenan, whey protein or whey, whey protein isolate or concentrate, pectin, protease, protease enzymes, flavors, flavoring, natural chicken, beef or pork flavoring, seasonings (Most assume this means salt, pepper or spices and herbs which sometimes it is.), soy sauces or extract, soy protein, soy protein isolate or concentrate, cornstarch, flowing agents, white rice or oat protein, protein fortified anything, enzyme modified anything, ultra-pasteurized anything, fermented anything, And yet more that may contain msg . . . modified food starch, rice syrup or brown rice syrup, lipolyzed butter fat, low or no-fat items, corn syrup and corn syrup solids (some companies use another process to make their product, saying it is MSG-free), citric acid (when processed with corn), milk powder, dry milk solids, protein fortified milk, annatto, spice, gums, dough conditioners, yeast nutrients 
author's note**in my opinion this is a good list but not a complete list... my advice... read every label and research for yourself to find out exactly where MSG hides. I have found it in whole meats and dairy products that I assumed were whole foods. I was wrong.

Hidden MSG:

Foods To Avoid:

MSG Sensitivity Symptoms

5 Part Series on the Dangers of MSG:

<a href="">The Dangers of MSG - Part 1 (Flavor Enhancers, E621) -</a>

<a href="">The Dangers of MSG - Part 2a 'Your Brain's Biggest Enemy' (Flavor Enhancers, E621) -</a>

<a href="">The Dangers of MSG - Part 2b 'Your Brain's Biggest Enemy' (Flavor Enhancers, E621) -</a>

<a href="">The Dangers of MSG - Part 3 &#39;MSG, Cancer &amp; Your Heart&#39; (Flavor Enhancers, E621) -</a>

<a href="">The Dangers of MSG - Part 4 &#39;Avoiding the MSG Threat&#39; (Flavor Enhancers, E621) -</a>