I need help but i dont know how?

well i guess ill get stright to the point here im a drug addict i consider my self to be a functioning one i have a job i live with my parents i mean i eat well its not like im hungry or dirty stealing to get my fix. but now to the matter at hand my addiction it all started about four years my junior year of highschool one of my family members was in a some what serious car accident no body died thank god buta member of my family was injured causeing there to be pain killers in my house at first i was like cool free drugs its not like it was my first time useing drugs i had been smokeing weed daily for a year or two prior and taken pills before but never had a chance like this so at first i was just picking at them takeing one here and there but over time i began takeing them every single day trying to test my limits continued on this path until the perscriptons were no longer required then i turned to the drug dealers to get them everything and everything this is also where i first tried herion for the first time never had a soild connection for it so i just stuck to the pills up until about year and a half ago i got my most recent job wich i still work at to this day this is where i really just fell down the hill so to speak i made a friend we didnt talk drugs at first but i feel we both know that the other was a drugie well it turns out he was and he sold the strong stuff mostly herion 80mg oxys and 60mg morphine pills he constanly had something and since we worked togetherhe knew when i got paid so he was willing to front the drugs to me but recently its all become to much i feel like its all becomeing to much i get very sick when i dont use drugs. what im asking here is shoul i go to rehab and lose everything such as the good job i have wich i have alott of potential in and alot of opportinty ahead of me, i would also lose my family who iam very close with i cant imagine the heartbreak they would feel if they knew i just couldnt do that to them.... besides this post my friends that have been very close to me scince we were teenagers know about this but they really dont know how to help me they try to help best they can but i dont want to put this burden onto them as well. is this normal for anybody out there i really need some advice wich love do i give up job and family or my drugs please help me! i dont know whats normal anymore!!!!