You're probably rattling right now. Having w/d symptoms after using opiates is normal.
You remind me of this guy I knew, he said he was using heroin off and on for days, then one day he fell 'ill'. His buddy said, you're rattling mate, and he did not know what that meant. So, he goes, here, try this. And gave him a line. That sorted the guy straight out! The guy was all like, OH! I'M ADDICT!?
I remember by the 3rd year of doing H when it became like a few days a week, and the concept of addiction was still not even there in our heads, "we are smart users, we don't shoot" funny, haha, and we'd look at others who were already serious junkies and say "we're not like them and we know what we're doing". One of those days, i went down from my car to meet our 1st serious dealer, who od'd a few years later, and my body was aching and he could see it and said "you're tired huh!" with a wicked smile, like he's internally happy having us join the club, mo.fo! I was still 25 and have played sports for all my life and took care of my general health even with my drugs intake since i was 18. Back to that same day, a younger cousin was with us (buddy and I) in the car and as soon after scoring , i parked the car and asked him to drive so i can "make" us a few lines (only a short time later i could do it all while driving) he looked at me and said with a surprise: "the house is 5 mns. away", which was true, but i was looking for that comfort since i was aching for real, i remember my lower back, oh man! This memory hit me when i read the above post, I was beginning to understand what withdrawals and dependence were and why Heroin has been the only drug i haven't done till i was 22, knowing that i have always LOVED any altered state.
Once again, sorry for getting this out in here, but again , i just dosed my lovely Subutex and felt nostalgic and chatty. Addiction is the worst, you're barely alive. When i see a 16 yr olds opening threads to ask where to get needles from, it kind of break my heart a little...if they only knew! I'm so glad Bupe is around now, it's really a wonder drug that if used properly, can do miracles.
Ok, enough, I will leave you with a quote from Metallica's Master Of Puppets:
Taste me you will see
More is all you need
You're dedicated to
How I'm killing you
Come crawling faster
Obey your master
Your life burns faster
Obey your master
Master