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It's a risk of the trade - last time I had an issue, it was an inn of some repute in Truro....both of us hit, me less so as I got it out of me quick when I realised what was happening. The commonality was the starter 'linguine crab'. I phoned the owner-chef next day and he comped the meal....however, I sensed that he had his suspicion on who it was as to the sous chef who had prepared the dish and that there was a hygiene issue. He was also livid at the waiter, who I had asked to tell him of what had happened as, in my case, it started in the Inn, the first sign being going to the loo and releasing the most enormous belch, worthy of a Cornish fog-horn!
You just have to get back on the bicycle and give it a go. The only thing I am not partial too is jellied or potted seafood like Morecambe prawns and your local eels.