If you have a supportive boss who doesn't mind that you are out for a while, then you might want to consider taking it easy and not working.
I am a high school English teacher and department chair for 30 teachers. This year I have missed 8 days due to UC. I was in the hospital for 5 days and then three days I was home very sick during another flare. Other than that, I make it to work.
It hasn't been easy-not like I can just leave the students to go. When it is a really bad flare, I make sure not to eat anything or drink anything until I get home. If I absolutely have to go- I would call my neighbor and let him know to keep an eye on my students. One time I didn't make it entirely on time. Luckily, there was no one around to see the accident.
Like someone said, I don't know how I made it some days. I have very supportive people at work that know about my disease and help me out.
Thankfully, I have been feeling much better for the past three weeks.