Some of my favorite writers on meditation and acceptance: Tara Brach ("Radical Acceptance"), Pema Chodron (anything), Thich Nhat Hanh. I was not doing well with regular meditation or even slowing down or mindfulness until I realize I had to find supportive ways to first release some of my energy...whether panic or just the scattered sort of energy. It helps me a lot to go for a walk, do something stretching, or do something that requires a bit of muscular exertion but is slow and mindful, like certain forms of yoga or Pilates, before trying to just be still and meditate.
Sitting still always felt too passive for me, but I have been drawn towards the idea and wish of "stillness" for a long time. Now I know it just helps my body to reach that in manageable steps. Or, if stillness isn't okay (my meltdowns revolve around feelings of being trapped or immobilized) I can at least do yoga or Pilates in a slower, more mindful way that can pull me out of the trapped stuff somewhat and back into the present. Then maybe I can at least be in child's pose or something still place for a few minutes. Realizing I am changing, but it has been slow and very subtle...has taken consistent commitment to my body's process of reorganizing all that scattered energy. Mostly able to avoid full blown panic attacks or need to burn myself in the past year.