Is IBS considered a physical disability?

Can you answer debtiff22’s question about IBS?:

I’ve been diagnosed with IBS. I’ve had it for some time, and it affects every part of my life, including my work. I sometimes have to be late for work because of the IBS. Can I tell my employer that I have IBS and that it is a disability? I am willing to work late, but I am getting in trouble for being late, which I can’t help.

Treatments For Ibs