Do you have a doctor that you regularly see? I don't know what the rules are like in the UK, but often in the US employers are willing to let absenteeism slide a bit more if they have a note from a doctor as opposed to you just calling in and saying you're sick (I believe you are sick, you know you are sick, but they might not). I know some doctors who are willing to write off your absences later on or develop a system where you call in and they can fax a note over. It might be worth a shot.Another option is taking a look at the work environment. Are there ways to still come to work but to back off (yet stay at work) while you're symptomatic? If you're in an office, is it possible for you to have your own bathroom or be moved closer to the bathroom? I'm generalizing here because I don't know the specifics of your work place and your job.Are you being properly treated by a doctor and been officially diagnosed with IBS? It's a little bit rarer for an IBSer to have vomiting, but not completely underheard of. The better you can get your symptoms under control, the fewer days you'll miss.There is a brochure off of the main page which helps non-IBS people understand what is going on with you. If that does not suffice, perhaps your doctor could write a general note explaining your condition to your boss(es)? Getting legal involved at this point might just wind up making you lose more money, though it depends on whether your work has any sort of disability, HR, etc representatives who might be able to help you.Good luck and best wishes!