I have not...
...but I understand the 'trapped' feeling completely!
If you go for it, let your practioner know of your concerns, and see if they'll allow you to get up for a walk around break if need be.
Also, you may want to wear headphones with a relaxation app to help you get through the appointment.
![smile](/community/emoticons/smile.gif)
Let us know how it goes if you do it!
S.C.