Hope this is not a duplicate of information. My Father, expat went to INDEN (Instituo Nacional Diabetes Endocrinologia) in Los Rios in Santo Domingo. An excellent total Diabetic hospital. It was 1960s building but had every bit as much knowledge and help as any American facility. I would definitely try there... See:
Instituto Nacional de Diabetes, Endocrinolog?a y Nutrici?n | International Diabetes Federation
Instituto Nacional de Diabetes, Endocrinolog?a y Nutrici?n | International Diabetes Federation