I'm sorry your co-workers are giving you such a hard time. Have you tried talking to them individually; sometimes when people are in groups they're not very good at listening.
I'm not sure where you are with your IBS-symptoms. Are you diarrhea or constipation predominant or do you alternate between the two? Are you stable yet? Are you following Heather's Eating for IBS diet guidelines? If you've been reading Heather's books and this site for a while, I'd recommend taking something IBS-safe for you to eat to a potluck. That way, you know you won't be hungry and your coworkers will see that you're trying to be social.
There are some great potluck-type recipes on the recipe board that even non-IBsers will enjoy. Here's a link to a few good ones: Super Easy Pasta Salad
I hope this helps. You might try posting your question on the IBS Diet board - people should be able to give you tips on how to manage people who aren't understanding of IBS sufferers.
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Re: How to say "no" to potluck at work, when you have IBS?
