Welcome to the forum! Even tho you didn't state how many mg's of hydro/oxy you were taking before you went on the subs, I can tell you from my own horrible experience that you are sick, vomiting, having anxiety, etc. because you are putting MUCH STRONGER opioids in your body by taking 16 mg of subs per day than you were ingesting previously while taking hydro/oxycodone.
The greatest misunderstanding out there is that subs are a good way to avoid w/drawals regardless of what drug you are trying to w/draw from.
Sub w/drawals are MUCH stronger and totally synthetic...their half life is much longer than short acting hydrocodone/oxycodone.
Just to give you an idea....1.2 mg of sub (bupe) = 30 mg of hydrocodone
So if you are currently putting 16 mg of subs in your system...that would be equivalent to approx. 480 mg of hydrocodone!!!! Here's an equivalency chart I found when I was going thru a similar mess....maybe it will help you:
http://www.medhelp.org/user_journals/show/18499/Conversion-table-other-drugs-equivalent-to-sub
I was a hydro abuser/user.....I went to a sub dr as recommended by my PA...but I was in "crisis mode" and probably would have done ANYTHING; I, too, was put on 16 mg/day.....had many BAD experiences....was on subs a total of 28 days....jumped off at 16 mg....I was a complete NUT CASE......hope you find your way and this helps~