I have an experienced amount of hallucinogenic journeys under my belt. My Salvia experience by far was the hardest trip of my life. Not to mention the most afraid I have ever been. It was not at all what I expected strength wise due it being a legal substance in my area. I will eventually draw out my experience report on these forums, but for now I am curious if anyone can shed some light on why this reaction happened to me.
It was 60x and the first time passing over. 3 packed bowls were smoked. Apperantly witnesses said I was running away and around in circles in a fenced off back yard for over 30 minutes. Tripping over objects, falling hard and running in to objects. My eyes were open, but what I saw was a completely different world. When I came out of it one of my buddies whose house I was at took me in to his room so I could lay down on his bed. I was extremely stressed by that episode.
While laying on his bed for a few minutes we were just talking about what I saw. It was very hard to talk. Then my body went in to complete spasms from head to toe. I felt and probably look possessed. My body was bouncing 1-2 feet off the bed for minutes. We were both crying trying to understand what was happening to me, fearful of possible death. My friend said he was calling an ambulance, I said not to if I was truly leaving then a ambulance will not make it in time, if I did make it then we would have some undesired explaining to do.
Well I made it, thus how I am able to post to this day haha. This happened over 3 years ago. If anyone could give some insight it would be much appreciated. I do not want to keep wondering. By the way I have had no history pre or post experience of seizures or spasms.

I've never heard of it happening, but it could have brought out an epileptic episode or something like that. Something latent that you're unaware of.

That said, I would say that this experience sounds typical of an extreme overdose. Doing it in the wrong setting as well. This isn't an experience anywhere similar to cannabis. Passing around bowls of it with friends is how you not want to do it Also you weren't clear about the dosage really...I assume you mean the three bowls were passed around a circle of friends in a backyard. You were almost certainly fighting the experience tooth and nail, and that could have been a possible reason for the convulsions.

People often underestimate the strength of Salvia, to their peril. It demands respect. Nutmeg is legal and if you take enough of that, well, look it up on erowid

If you feel up to it I would love to read an experience report about this episode.