There are 2 basic stages of opiate withdrawal.
The Short-lived, Acute, intense, immediate withdrawal which occurs directly after stopping all opiates. "clucking", shakes, profuse sweating, chills, gooseflesh, body temperature instability, autonomic instability, "revved-up," diarrhea, cramping, bone pain, mental anguish, etc. (takes ~3 to 10 days depending on the half-life of the drug)
PAWS or "Post Acute Withdrawal Syndrome." This is the more drawn-out phase of withdrawal...as the body learns to cope without the drugs. includes boredom, insomnia, self-doubt, 'restless legs,' depression.
...
The most important thing to remember during PAWS is AWARENESS that PAWS IS ONLY TEMPORARY!

With time, PAWS will go away!! In fact, with few exceptions, it seems that with every passing week, PAWS symptoms can be demonstrated as improving--sometimes DRAMATICALLY compared to the weeks prior.