1.5 weeks only? I don't think it's even possible to develop dependency that quickly, I don't think you should even take anything at all. Have you been been physically dependent on a substance before?
Just exercise as much as possible, get lots of sleep, eat healthy and take vitamins, and just don't think about it. Use this as an opportunity to take a break.. taking substances should not automatically be your first instinct, it should be your last resort. It concerns me that you took 3 of the drugs on your list without even waiting to see if you had any WD symptoms. You're starting a bad habit that will have some very serious consequences on your life.
Hope this doesn't come off as a big lecture. But I quit Oxycontin cold turkey after almost a year of daily use. I wanted to do CT because I wanted to know just exactly what I'd gotten myself into in case I had the brilliant idea to relapse. It was a horrible nightmare, truly. For two weeks I was in complete physical and mental agony. My body hurt all over, I had extreme RLS, insomnia, vomiting, diarrhea, night sweats, chill, fever, anxiety... I was either extremely cold to the point where I was shaking and covered in goose bumps or I was extremely overheated and literally pouring sweat. There was no middle ground, just extreme hot or cold.
But that was the easy part. I can deal with physical discomfort. It was the months that followed that were bad... I just never stopped feeling lethargic and the heightened sensitivity to pain meant I was constantly uncomfortable and in pain. I had anxiety and depression. I just never felt "okay," every day was a bad day. It just got to the point where I wasn't able to work much, I couldn't leave my house.. I basically just stopped living my life, I couldn't do anything. So I said fuck this. I haven't used Oxycontin since I quit but I've been using other opiates I don't like as much on a regular basis. I don't use daily and sometimes I don't even use weekly.. But I'm not kidding myself, I'm on a slippery slope.
Once you're addicted you can never go back. If you've got a scrip then I'm sure you have legitimate pain and abstinence may not be an option. My advice is just not to take the easy way out. Whenever you can, go a day without your oxycodone. And if you're in pain or want to feel good try and use the most basic methods (exercise, stretching, chiropractic adjustment, vitamins, healthy food, advil, etc) before working your way up to narcotics. It will really help you in the long run. You don't want to get in the habit of using a "quick fix" for all your problems.
But like I said, I don't know what pain issues you have that require the script. I just know Oxycontin really ruined my life in many aspects and set me on the road which I am now.