Why not? Don't be shy! If you KNOW it helped you - then you KNOW it can help others. Share the ways you learned to short circuit the freeze response please!
My pleasure! I would add the caveat that martial arts isn't for everyone, especially when you have PTSD. It can open a huge can of worms that you don't expect and may not know how to handle, as it did with me. So proceed with caution. And if you decide to go there,
definitely tell your instructor about any issues (mental or physical) ahead of time so he can work with you. Any instructor who won't has no business teaching.
The main skill I learned was breathing. We have several different styles of breathing for different purposes. Anyone can practice those skills on their own and it will take them a long way toward improving their lives. Practice breathing slowly, deeply, and evenly. Breathe like that in a variety of conditions - while being a couch potato, while jogging, while having a pleasant or intense conversation. All the variations you can think of. It's especially helpful to practice it in stressful situations, whatever that means to you.
Also, practice breathing deeply and very rapidly. It looks like hyperventilation (and if you start getting dizzy, slow down.) Do this immediately after a big physical exertion or if you're feeling anxious. The flood of oxygen will slow your heart rate back down to normal.
There's also square breathing, which is great for anxiety and panic. Inhale slowly and evenly for a count of three, hold your breath for a count of three, exhale on a count of three, and hold yourself on empty for a count of three. Any count will do. The point is to slow yourself down and create some psychological space. With practice, you can do this while exercising too.
A major point of these breathing techniques is to teach your body to process oxygen more efficiently. It can short-circuit panic because panic so often comes with the sensation of being unable to breathe. Even if the panic is so bad that you can't inhale, this gives your body additional time and psychological space to keep your options open so you can react rather than (or before) freezing.