Especially if you are a newbie, about half an hour or so after injection your body feels kind of anxious, heart beats a little faster. I hate that feeling. Only seems to happen on the first injection usually...
chordz- I am not a newb, but I get the same shit. I feel it while injecting though. Just a little anxiety I believe. I also sweat while injecting sometimes. I'm sure everyone has had this.
I think in my case once the gear starts getting into the blood stream is what causes it. Almost like your body is saying "what the hell is this" but then next time it really likes it!
chordz- I am not a newb, but I get the same shit. I feel it while injecting though. Just a little anxiety I believe. I also sweat while injecting sometimes. I'm sure everyone has had this.