I think we can assume it was the salmon, unless you have had anything else too high in fat. When I have had a reaction to food it has been about 1 1/2 days after the event.
Hope you're okay for work, it has only ever made me need to get to a loo quickly rather than anything else {sure you'll know what I mean without spelling out!}
If you're stomach rolls over or gets gurgly head for the loo hun. x