I had the same problem when I was taking 500mg of Sustanon a week on my last cycle. I'm thinking the sust was just bad, but the expiration date wasn't until Oct. 2002. I'm going to try T-200 this time. I'm thinking that maybe Sust just doesn't work for me, or I need to try another brand. I was taking 500mg of Sustanon and 400mg of TT EQ. My sex drive actually went down when I was on the cycle.