Alpha is triggered by simply closing your eyes.
For something to do other than worrying focus on your breathing. The with your eyes closed give yourself some positive affirmations.
When you do this often it becomes second nature and you get to the point where you just need to intend to close your eyes and relax and the mind will start doing it before you even close your eyes.
Good technique to practice a lot in preparation for stressful situations. Exams and job interviews for example.
Alex