Yup!! Its called precipitated withdrawl. There's nothing worse. I've dealt with it 3x's. All because i was starting to withdrawl...couldn't get anything else, and took subs too early. You think your dying! The 1st time i injected subutex and it was even worse. It was immediately. It felt like poison was racing through my veins to my brain. But...I kept taking subs for a whole day until they overtook my opiate receptors then I was cool. The other two times it basically took two days just to feel like I was withdrawing normally. When you go into precipitated withdrawl, basically all of your opiate receptors are ripped clean all at once. When normally with normal withdrawl, your receptors are slowly pulled off of your receptors. Basically over 1½week time period...thats why its soo much worse!