I don't know about opiates, but when I quit drinking I went the other direction. I was full of energy to the point of being almost manic. My sex drive went through the roof and I couldn't find enough things to work on around the house. I have since stabilized and am pretty much back to normal, less the health and mental issues associated with alcoholism (for the most part).
Your body is going through withdrawal and your doctor is best equipped to help you. Talking (in this case, typing) to others in the same boat can help ease the transition. Exercise helps too ('cause it generates a natural "high").
RockALittle
I need Advise PLEASE