I have experienced that too, I'm never sure if it's lupus, a bug of some sort, or just one of those things! Usually it doesn't last more than a few days, 5 days tops in my case.
Since this is an ongoing problem, I would be requesting a trip to a gastroenterologist to more fully investigate the problem. I did, and found out about a few problems I have (gastritits, colon polyp for example) which are probable unrelated to lupus directly at least. A GI doc consult seems to be in order for you - to know better what is causing it. Sometimes it's lupus directly attacking the intestines, or vasculitis, sometimes there's no known cause and it can be IBS. Biopsies and having a good look at things will better guide treatment... good luck! {it's not that bad... don't worry!}
Since this is an ongoing problem, I would be requesting a trip to a gastroenterologist to more fully investigate the problem. I did, and found out about a few problems I have (gastritits, colon polyp for example) which are probable unrelated to lupus directly at least. A GI doc consult seems to be in order for you - to know better what is causing it. Sometimes it's lupus directly attacking the intestines, or vasculitis, sometimes there's no known cause and it can be IBS. Biopsies and having a good look at things will better guide treatment... good luck! {it's not that bad... don't worry!}