If you have any medical condition that you fear cannot be addressed in JA, you should seriously re-think your decision to vacation in JA.
The medical care in Jamaica is vastly superior to that in Nevis. Its all relative.
Since I travel and do stupid things like ski, spearfish, climb things and generally get into fun trouble, I have medical evacuation insurance. This insurance will repatriate me to my hometown or anywhere else I choose in the US to have medical treatment. I use this company, it isn't the cheapest, but it is the gold standard. http://medjetassist.com/
