Hello there.
Okay, for starters...you MUST seek help immediately ASAP if you're questioning what you might do. Seriously, while I understand you feel horrible, the answer isn't to do anything rash. There ARE options...how about an inpatient detox? There are some state run facilities that you may be eligible for. Start calling around, or head to the ER and ask for help.
What dose of the subs did you come off at?
Hang in there...I'm sure it's rough, but you have to try to maintain your composure. ANY questions at all about what your thinking...and you get yourself help STAT, ok?
What part of the world are you from? Have you tried the ER to see if they can do anything for you. I'm not very familiar with subutex, but I'm sure someone more knowledgable will be around shortly. In the mean time hold fast and don't go anything you will regret....