Chillblains

Last year my doctor prescribed me nifedipine to prevent chillblains as i suffer terribly every year. This year I changed my doctor surgery, my new doctor is very reluctant to prescribe them as my notes are not yet with him and he doesn't recommend them for chillblains. He also says he wouldn't know what dosage to give. What dosage would you recommend for this use of nifedipine?