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Dianne,
Those are the worst situations to handle.  In September, I too, was
"poisoned" by some very dear friends.  I'm guessing the marinade the pork
tenderloin was in prior to cooking may have had soy sauce or SOMETHING in
it.  I DID get home before getting sick which was a trick since they live
30 miles away.  I didn't want to tell them I'd been sick all the next day
due to their cooking so I wrote a note to them thanking them for the nice
evening and asking for the recipe since my hubby loved it so much!  That
way I'll know what got me and can caution them about that ingredient next
time we go to dinner there!  I hope this approach works as this is the
first time I've run into it in such a big way!

Vicki
WA state