Definitely sounds like a comedown. When i come down off opiates i usually start getting really agitated with the smallest things, i start feeling sore and beat up, and always want more lol. It is most definitely NOT physical WD however it could be some form of mental addiction of loving that feeling so much you want to be back to where you were on it. The combination of coming down and loving that amazing warm blanket of opiate bliss is what got me addicted physically in the first place so be careful! Opiates are fun at first but over time you will learn to hate them and just want them out of your life because you cant have a life without them eventually. You are wanting to feel that high again and that is normal with opiates. Just be careful mate, they go from awesome to a necessity in the blink of an eye and can potentially ruin a lot of stuff in your life pretty quickly. Hope you get over it and learn to stay away from them now!