MDs, help!

I just got my last injection of neupogen, but it was the most memorable shot ever in the history of ouchness. Taking the dose right out of the fridge, label instructions say to keep it 36F-46F, nurse kristy apologized before jamming it in my tender arm. !!! She said it was due to the cold needle. A study in the Clinical Journal of Pain mentioned testing influenza injections cold vs room temp with no discernable effects and with the intent to study cold needles as a form of analgesia. What?! Is this nurse pulling my tail?

Ed. note: it's cold drug solution, not cold needle that causes nocioceptor disaster