For my free floating anxiety I usually try breathing exercises. It was how I was taught to deal with panic attacks years ago.

I found this the other day. It's for kids but it's the same principle as I was taught. You do it ten times and it slows down the heart rate and calms the respiratory system. I hope that maybe it will help you.
Mindful Minute Articles

A Mindful Minute: 4-7-8 Breathing Exercise for Kids (Video)

Monday, December 29th, 2014
This mindful breathing technique is simple, yet powerful. The best part is it can be done anywhere and requires no equipment whatsoever. Breathing exercises can help shift the nervous system away from fight-or-flight mode (causing racing hearts, sweaty palms, shallow breathing etc.) into rest-and-digest mode (where the body heals and regenerates by performing tasks such as digestion, detoxification, elimination, and bolstering immunity.)
This breathing exercise is a wonderful way to calm anxious states of mind and body. Remember, any exercise should be done to one’s own comfort level.
To try it, watch the video above or follow these instructions:
1. Sit upright on the ground or in a chair.
2. Take a deep breath in through your nose to the count of 4.
3. Hold your breath to the count of 7.
4. Exhale through your mouth to the count of 8.
For more animated mindfulness and anxiety relief exercises for kids, visit us at www.gozen.com