Earth Dweller,

With all due respect I do not think someone can be allergic to DMT it being endogenous and a part of regular human metabolism (dreams, visionary experiences, etc...)

However, if this was an allergic reaction, it could be to any number of other things.

I think the OP said that he tried it again in a smaller amount and it was fine.

The point about DMT not being for everyone, yea that's definitely a thing; some people want to keep sleeping.

I know people that are a lot more comfortable visiting these realms under the guidance of a trusted Shaman, but to each his own!