Praying for you and your little sister Anon. May God bless you and give you and your sister the strength to deal with whatever comes from the diagnosis.
Be patient, but persue the answers and researcch the problems yourself. They thought I had MS one time. It ended up being a infection in my Spinal Cord. Don't accept the first ideas thrown your way from the Drs. Persue second opinions. MS is sometimes hard to diagnose.