Has anyone accidentally taken twice their dosage and had bad effects? If so, what were they?

I forgot I had already taken my evening dose and so took 600 mg of Lamictal instead of 300. I assume that was it, because I had a terrible night of feeling so dizzy I could barely walk without lurching, and I also could not reach for a bottle of water. I vomited about ten times, although I had no food in my stomach. In the end, I was so exhausted I could not even get up off the floor to change my clothes. I slept for most of 36 hours and recovered, but I had occasional sick headaches for about two weeks.

Anyone had anything similar?