Hmm, I have the same thing, I often pass out about 15-30 minutes after, can foam at the mouth, usually it's when they put things in, not for blood tests, although I had a seizure on my midwife. (apparently I kicked her) >.<
My first one was after the meningitous jab, about 12 years of age (now 21), I remember just talking to my friend then the next moment bam!
I wasn't scared of them then, however, I do get worked up now as I'm scared of embarrasing myself. I was never scared when they first happened however. (although no one enjoys them!)
I was wondering if it's a chemical they use to make people's blood react to the jab. I know they used to use small amounts of mercury, but they changed it, I was thinking maybe thats what now causes it?
We would need someone in the pharmacutical industry rather than a doctor as they understand the drugs better maybe though?