I'm on week 6 of a Test E only cycle and I got the "test flu" after my 2nd pin and after my 4th pin. Basically it comes on pretty much exactly 48 hours after the pin. I feel like pure crap all day and almost feel like throwing up. Then when I get home I can only lay in bed, shiver and sweat all night. I take 3 advils and sweat all night. Then when I wake up the next day it's over and I feel better. Also it happens when the redness at the pin site gets the largest. Pretty much the day of pin the site looks fine. The next day it will be red about the size of softball. Then on the 2nd day my whole bicep will pretty much be red and then the flu part comes. Once it passes the redness goes away and we're good to go again until 6 days later when the pin comes.
Yesterday was pin day for me this week and I am keeping a heat pad on it to try and keep the redness down, but I don't care about the redness just the flu part.
Tomorrow will be 48 hours after pin so hopefully I won't be feeling like death at work tomorrow. I had the flu last pin so I think I might be OK this one, it almost seems like it's every 2-3 pins or so it happens. I'll update this thread later if anyone cares.