Tinkerbelle, I get in the same funk as well. I think it's part of what contributed to my current anxiety problems. I stayed home so much that just leaving the house became a huge issue for me. Linz is so right! Just a short little walk around the block can make you feel so much better! Or how about a hobby--something you can work on at home that will get your mind off IBS for a little while?
I just want to add that if you're not up to exercise yet, you could find some place to volunteer. It doesn't have to be a long term commitment, many places accept as little as two hours a week. It would help you get out and you'd feel good about yourself. As a library employee, , may I suggest volunteering at your local library? Libraries usually have a variety of tasks and great bathrooms!
I hope you find the support and resources you need so that you start feeling better SOON.