Hi Arleen,
I think someone on the boards once said you needed a doctors prescription, but, I'm not positive. I would contact the company and ask them how to purchase one. If you need a doctors prescription, I would think that one of the zillion dentists you've seen could write you a prescription. After all they put you through, they at least owe you that much
I hope you are feeling better lately. If the tense unit helped you, I hope you are able to purchase one.
Take care!
velvetgrl