I went through 200 cc's before it ever happened to me. It happens evey now and then to me now. I can go through 30cc's, get the "pins n needles n cough" for the next two cc's and then not again for 20 more. All from the same bottle.
Seems when I have more tren in my system it does it more. I can stop shooting it for a couple days and then go back to ed and not get it again for awhile. my .02