What documentation needed for medical deductions?

Last year, I was dealing with severe back pain that conventional medicine in the US could not help.  I went to Panama for stem cells, which made me pain-free.  The cost was $25,400 which was a package (treatments, hotel, airport transfers), the airfare also cost $2389.07.  Took a long time to save this money up, but it was well spent.  Is any of it medically deductible?