I worked through a five year flare and only missed a few days. My employer was very accommodating, though, and on really bad days I sometimes worked part of the day from home. I'm a manager and can access all the computer files from home, so that helped.
For at least three of those five years I got up in the morning (3 hours before I had to leave, of course), spent my 1-1 1/2 hours in the bathroom, got myself ready and went to work. Fortunately it's only a 15-20 minute drive. At work I'm able to go to the bathroom as often as I need to, but I also kept a change of underwear and clothes in my office as well as a box of wet wipes.
By the time I got home I was exhausted, and crashed. I just rested at home. MY DH pretty much did all the cooking, laundry, etc. Yes, he's a saint. On the weekends I rested so I could make it through the next week.
It was very hard, and there were a lot of times I thought I might have to go on disability, but my work is such an integral part of my identity that I really didn't want to quit. As soon as I started feeling a little better, I was so glad I hadn't quit. During just a "normal" flare, it was pretty easy to manage because I was only in the bathroom four or five times during the work day instead of every 30-45 minutes.