Julie,I think it is not uncommon for people who have had their gallbladder removed to develop IBS - we have several members on the bb that have had similar experiences - so hopefully they will see this post and be able to offer you support and the benefit of their experiences.It sounds strange that you seem to be suffering worse around your period and you say you never had that before - so yes it might be worth a mention to the doctor.However, most female sufferers of IBS do comment that their IBS gets worse around their periods - so it could just be that your experiencing.I found the following which describes the main symptoms of endometriosis
Clair
If your concerned, you should really speak to your doctor he/she will be able to diagnose if you have endo and be able to suggest either tests or treatment that can help.Gee - our bodies are complicated things aren't they?

