Anything that increases arousal can trigger active ptsd stuff. You can calm the symptoms by attending to your health. Reduce stimulants, do yoga, keep steady blood sugar, build muscle and increase cardiovascular conditioning. Walk. Treat allergies. Meditate.

Then do whatever therapy works for you.

And try David Bercelis Trauma Releasing Exercises. They are simple free stand alone self administered exercises to induce the body's natural tremble mechanism. See folks do it on Youtube. Ask your library to order his book or DVDs. You can learn from the book. Or find a facilitator on his website. Or learn from the book. It's on kindle. It's that easy. It's an easy book too. You can watch tv or play with the dog while you do the exercises and tremble. It's that natural. It's pleasant and relaxing and you feel like you've had a massage. And its free. Except for the book which your library can buy for you..David says in the book the book is all you need and he has always presented his
exercises as stand alone self help.