Are the pattern and sequence of presentation of signs/symptoms useful in diagnosing autoimmune disease or are they different in every case?

Individual: Doctors generally follow guidelines to diagnose autoimmune disease, including blood tests, x rays and symptoms and signs. Everyone is different how they manifest them but the guidelines apply to most.

Often yes: The hallmark trait for pandas is sudden acute and debilitating onset of intense anxiety and mood lability accompanied by obsessive compulsive-like issues and/or tics in association with a streptococcal-a (gabhs) infection that has occurred immediately prior to the symptoms. Other autoimmune disorders often also have a characteristic history.

Yes and yes: We know of numerous diseases which involve auto-immune mechanisms. The variation involves specific genetic susceptibilities, associated with/without environmental triggers. Joint issues, rheumatoid arthritis; bowel issues, ulcerative colitis; brain and spinal cord, multiple sclerosis.