hi kelina, you'll find you receive many replies not just mine. first off none of us can get another person clean and sober i'm sorry to say. but you can go to a 12 step program for you...al-anon. you will find others who are dealing with a loved one who is addicted. it's a great support system and costs you nothing. if you're interested...don't know where you live but..here's the link for meetings http://www.al-anon.org/meetings/meeting.html
i'm so sorry your sons and you have to thru this but hopefully they will want to get help. and you need help too. the other thing..it would do no harm if you sit down with them and tell them how their using affects you, and how frightened and alone you feel. perhaps that may be the seed planted that will yield them to think about what they're doing.
if you wish you can pm me anytime. i don't have all the answers but happy to help if i can. -madi