Adderal Shortage?

If having ADHD were not frustrating enough now there seems to be a National shortage of Adderall. After going to 1/2 dozen different drug stores I was told that my time released Adderall is back ordered with the manufacturer and that I would need to get a different script from the doctor. I got a new prescription and they told me they could only fill 15 days worth and now I have to call and get another prescription. The frustration is mutiplying and I am not sure what the answer is. Why is it so hard to get the meds my daughter and I have been doing so well with?