Concentrate on being alive now and keep yourself distracted! Four days is just great. Now, be sure you're eating and drinking enough. Take vitamins and minerals and eat fruits and vegetables.
DONT GIVE UP!!!!!!!!! I had a family member that was addicted to that and it took him several weeks before it was completely out of his system.... if you have the will power to stop heroin you can do anything!! you have support standing behind you through this.... its not as bad as heroin so it shouldnt give you the tremendous terrible withdraws... you will feel weak and your body will ache and you will probably get headaches but dont give up!!! it doesnt take long before that is clear of your system..... you can do it!!!