I've noticed with my lupus migraine I'm usually nauseated I'm unable to do anything during this time...
Nausea and stomach aches can occur in lupus due to inflammation, such as lupus enteritis, pancreatitis, or peritonitis. Medications like NSAIDs or corticosteroids may also irritate the stomach, causing issues like peptic ulcers or acid reflux. Random episodes could also stem from anxiety or food sensitivities. It's Show Full Answer
Also, keep us posted, please.
Wendy, a huge number of problems could cause this, including meds and inflammation of various abdominal organs, serositis, etc. Please see your internal medicine doctor and be evaluated as a first step and see if they want you to see your rheumatologist, too.
Take care, and if you have worsening, persistent pain, please get checked at the ER.