FWIW, I have found that I have developed an extreme reaction to MSG in all its forms, causes severe insomnia - e.g., I made fish tacos the other night, had bad insomnia and then found "modified food starch" on the label of my green taco sauce - it had never affected me before. So you might try avoiding sources of msg, if you haven't already.
OK that explains several years later why I once didn't sleep an entire night after eating tacos with a flavor mix.
Had that once from the powdered flavoring in noodles. I've gotten away with it occacionally in recent years and just got a headache. I guess things can change over time. Why does MSG have to taste so good.