I have been diagnosed with classic migraines. My first one was at age 12, and then I didn't have one until I was 21. Without any medication I experience a visual aura, loss of peripheral vision, numbness on one side of my face/mouth and hand (typically the right side), my speech doesn't make any sense whatsoever, nausea, and a severe headache on the same side of my head as the numbness (right side).
So ya, I completely understand what you went through. The precursor to the headaches are usually quite frightening.
Are you on any meds for your migraines?