Listen to this man.None of the things mentioned so far are actually directly linked with anxiety, apart from caffeine whose effects differ from person to person anyway, being anxiolytic for some and anxiogenic for others.
MSG hasn't been found to cause any more side-effects than other glutamates in those susceptible to them.
Aspartame contains nothing more than two compounds that are found in almost every type of food, bonded in a way that produces an insignificant amount of methanol (less than a glass of any fruit juice) when ingested. Even if the complete structure had some kind of carcinogenic effect, it's broken down so rapidly into it's non-toxic components that it wouldn't matter.
Really, if you're worried about MSG and aspartame, you should be avoiding tomatoes too, because they contain more glutamates per weight than any food containing approved levels of MSG and more aspartic acid/phenylalanine/methanol per weight than any food containing approved levels of aspartame.