Shame, an internal residual of trauma may interfere with your yoga journey. When your body begins to remember how to relax, yoga may do the opposite at first. Your anxiety may rise, therefore making you feel uncomfortable. While you take time to be still and be quiet, your body may want to run and go into fight or flight! Think limbic system.
With practice, your anxiety will subside and you'll succeed in relaxing into calmness.
Make sure you practice meditation and or yoga with a practitioner that is trauma sensitive and trauma informed.
Remember I'm not a doctor so do your own research and check in with your provider.