Yep.,I work full time too! I'm fortunate that I have an "office Job" and can have all access to the potty! Sometimes it does stink to have to work with a bad IBS flare up but honestly sometimes coming to work keeps my mind off of it. If I were at home I'd lay around and never get my butt moving and that probably would depress me!
I also look at it as I pretty much have no choice as I have to work full time. Part time is not an option!
Try the full time and see what happens. I think the longer you deal with IBS the more it just becomes a part of your life and you can deal easier. Good luck!