Pam: Welcome to this community. You will find a lot of very wise parents here who understand what you are going through. Just keep posting and reading the boards for a lot of good information.
My 18 year old son also started abusing k2 and then over the counter cold medicine. He got such a high from the over the counter pills that he started to take more and more pills every day. We refused to give him any money for his habit and he then started to shoplift the pills. He also started to steal jewelry from two neighbors to get money for his drugs and he was eventually arrested. My son has told me that if he was not arrested he might be dead right now from all the drugs that he was doing. So in a very strange way getting arrested probably saved his life.
Yes, I worried about my difficult child every time he left the house, and I was scared whenever the phone rang and our son was not home, It was a terrible way to live, and I am so sorry that you are living this nightmare. Has your son asked you to pay the money for the restitution from his stealing? You might want to talk to a lawyer to see if your son can be court ordered into a drug treatment center. He might agree to go to rehab instead of sitting in jail for his crimes. Please try to take care of yourself, even though it is very hard to do. Remember that you did not cause your son's drug addiction, and you can not cure him either. The only thing that you can really control is what you do for yourself. I will be praying for you and your son. HUGS....