In addition to the information already provided to you, I just wanted to add that SLE (Lupus) can cause seizures. When the central nervous system (CNS) has been affected by Lupus, it can cause the following: headaches,
confusion, difficulty with concentration, fatigue, occasional seizures and/or strokes.
CNS involvment due to Lupus is usually in the form of vasculitis. CNS vasculitis is inflammation of the blood vessels of the brain. It is the most serious form of systemic lupus. CNS vasculitis is characterized by: high fevers, seizures, psychosis, meningitis-like stiffness of the neck. It can rapidly progress to stupor and coma if not aggressively managed. Seizures occur when injured or scarred brain tissue becomes the focus of abnormal electrical discharges. These seizures may be a one-time occurrence or a persistent problem. Anti-convulsant medications are used to prevent seizures by controlling the brain's abnormal electrical discharges. CNS vasculitis usually requires hospitalization and high doses of corticosteroids.
As Rob mentioned, you son received prompt medical attention and that is in his favor. I do hope that you are able to be with him soon and that you are given some answers. I am keeping you and your son in my prayers and I pray that all will be well with him.
Peace and Blessings
Look For The Good and Praise It!