My pet snake was also a meth user for a long time, usually via IV and he keeps it occasional and dosemt take more than 1 good dose a day to prevent extra brain, cardiovascular,CNS damage. The only opiates/opioids he ever mixed with his crystal was black tar heroin, dilaudid, and hydrocodone, he hasnt tryed it with subs, so he dosent have EXACT experience with the combo but many closely related to it. With that being said, did you hold it under your tounge or swallow it? And how many mgs was it? Size? Shape? Color? Any markings on it like numbers and letters? The reason i ask for all this information is because if your friend that you got the sub from dosent have a prescription for it, that means he got if from another source which means it could have been a home made pill of random stuff and told your friend it was subs. If they are for sure real, how often do you use opiates and when was the last time and at what dose? If you had no tollerance to opiates and havnt touched them in in over a month, if what you took was an 8 mg subutex, im suprised you havent passed out already or havent gone into resperatory arrest. People with no tollerance will get pretty damn high from 1/4 of the pill which is only 2mgs meaning there is 4 doses per pill if you have no tollerance. If you notice it becomes really hard to breathe and your chest feels heavy like you have sand around your body or really feel like you will pass out or anything that is scary or too uncomfortable to deal with espessually in the chest region, call 911 and tell them you found a pill that you thought was asprin (you should tell them the truth so they know how to treat you properly but a lot of peope wont do that for whatever reasons they have) and now you cant breathe, paramedics will show up, assess you, ask you how you feel, what the pill looked like, take blood pressure and take you to the hospital, if you lied about the pills origin and identity, they will draw blood and possably a urinalysis to see recent drugs taken and dose taken, then they treat you accordingly. Now that thats out of the way, if it was a real subutex and you are in a psychedellic state, its probably from the fact that meth is highly psychoactive and can cause insane hallucinations and manifestations by its self with big enough doses, coupling that with a ludicrous amount of subutex (if you have no tollerance) is causing your body to release very large amounts of serotonin, a lot of dopamine, nor-epinephrine, nor-adenaline among many other neuro-chemicals in amounts your brain isnt able to process or even understand whats happening and the hallucinations could just be your brain trying to make sense of the extreme activity thats happening so it fills in the blanks basically with what it can. The sick feelings you have are more than likely due to a way to powerfull dose and your body is treating its self like it has been poisoned (it technically has) so its trying to rid its self in any way possible by sweating, possable liquid stool, frequent urination, vomiting, similar to when you get food poisoning or the flu virus. your dizzyness and faintness is more than likely from fast pulse and high blood pressure, so stay calm, deep, slow breaths try to lower the heart rate, if it wont happen, call 911.