These days, I don't go through that nearly as much. Of course, I am still more aware of what's happening within my body, but things don't make me panic. when I'm travelling, or eating food anyone else has prepared (very rare) I pay closer attention. When in doubt, I take benedryl. But, I can't actually remember the last time I took it.
Suddenly finding out food you used to eat (even love) has turned against you....kind of feels like being slapped in the face, doesn't it? or maybe that's just me! But it does become easier.