With the decision to get into a drug or alcohol treatment program your mind will begin to work against you.
It is pretty common to get anxiety when embarking on something new, but the addicted mind may take this to a whole new level. Going to rehab means giving up that drug or drink and your mind may build up a wall of things to prevent this from happening. It can be quite helpful to get into the proper mindset from the beginning, so you may be able to take all these things in stride.
One thing you learn in recovery is to “live in the present moment.” Before drug rehab, you can experience a bunch of unwanted anxiety about what is going to happen. The simple answer is not to, although it is not the easy answer. If you can, in these moments of stress, take the time to calm down. Addiction is a disease, a mental malady. Your mind is going to create this anxiety. It is a defense mechanism so that you will continue to use or get drunk. Focus on getting well again. Over time, you will realize that all that anxiety really was not anything.