With those symptoms, I'd suggest seeing your GP or PCP first, they can ask more questions and run preliminary tests and then refer you to the proper dr. You could have appendicitis, gastro problems, etc.
Lupus would be far from the first disease I'd consider, although it could certainly do that. You'd need other symptoms before heading for Lupus!
Lynnwood, Lupus & Sjogren's ModeratorDIAGNOSING-LUPUS & LUPUS-RESOURCES
"Life is far too important to be taken seriously" - Oscar Wilde