Had a huge promblem lastnight. While using a 25g 1in, for some reason, the pain was so much unbareable than usual. I had to literally go through like 8 neeles and syringes before i was done. used my shoulder and quad and the sh@t wouldnt pierce the skin, but when it did, it was painful each time like i kept hitting a vein. no blood though. whats the deal.