Last week I did my normal shot prob like a .3ish I think I might have put a TINY bit more then my usual amount though, I mainlined it an within seconds my entire body got pins an needles, heart rate went through the roof, breathing got very rapid, and the last thing I remember was my vision getting blurry an how anxious I was trying to control my breathing, next thing I know I was waking up my Vision coming back slowly while paramedics were just arriving on scene. I felt like I just woke up had no idea what was going on lots of confusion until I remembered the last thing I did was a shot of coke, my friend who was with me told me that I just had a seizure an I was convulsing and choking on my tongue which lasted about a min maybe alittle less. So my question is blacking out an seizing after a shot is most definitely an overdose right ? I always thought ODing on blow would be a very painful an aware experience but I went from euphoric rush to anxious panic the just blackout, if anyone has any info on what a coke overdose entails or if I should go get my heart or brain checked to see if the seizure damaged anything?