Depends what you mean by "soon".  Vibrio parahaemolyticus
www.cfsan.fda.gov/~mow/chap9.html is associated with raw and undercooked
fish and shellfish, but has a median incubation period of 15 hours (range
4 - 96 hours).  The median duration of illness is 2.5 days.

Contamination by infected food handlers or cross contamination with food
contact surfaces and utensils could also be at play. Staphylococcus aureus
www.cfsan.fda.gov/~mow/chap3.html has a fairly short incubation period.

While symptomatic, submit a stool sample to your local hospital or public
health department for analysis.

Rob
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> I prefer eating just about everything raw and it digests better for me. So
> the other day I had some raw halibut. Soon I developed cramps and pains in
> my stomach that were quite intense and kept me awake all night and in pain
> into the next day.

> Any ideas of what caused this? The fish tasted fine.