This feeling along with detachment, i can trace back to 1993. I was taking Seroxat and just put these crazy sensations down to side effects of this terrible drug. I kept having the falling through the pavement feelings when anxious. My doctor thought it could be down to depression, although i never found any benefit from taking anti d's. Have only felt the sedation no effect on low mood.
Fast forward a few years and it's happening again. I'm shaking anxious nausea and walking on a bouncy castle. I have low cortisol (15.3 total) could it be that, of just thyroid?