My first symptom now that I look back was fatigue. I remember standing in my back yard asking myself, why am I so tired all the time.
Then I ended up with optic neuritis - which caused me to have double vision in my left eye. Went and got it checked and no one clued in at the time.
What eventually ended up determining that I had MS was when I had (and still do) L,Hermittes Sign. That was back in 2007. Went for an MRI and well, the rest is history.
Have a great day,