Hi Alakananda and welcome to the forum. AYP strongly recommends self-pacing in all our practices, especially if there are any unwanted side-effects, or experiences that are uncomfortable for us as we practice.
I would start by reading the AYP lessons and just meditating, never more than 20 minutes at a time. Rest a few minutes after your meditation--->
http://www.aypsite.com/plus/MainDirectory.htmlEventually you may wish to add pranayama and more. But you can always reduce your practice time or the components of your practice if you are in any way uncomfortable. The benefits of meditation are profound, and it is worth putting the time in to reading the lessons and doing the practice.
And there is a wonderful community here of people who can listen and share with you if ever you have questions or concerns.
In light and love,
Kathy