Contact staff of the Bureau of Health Statistics. We may be able to steer you in the right direction. An extensive review of available data may end up providing you with your data needs. If not, it will, at least, enable you to further refine your objective and define the precise questions and population you will be studying. There are types of questions people are sensitive about and may be hesitant to answer correctly or at all.
Surveys are very time-consuming.
Also, the time of the year can be important. The worst possible time to interview is between Thanksgiving and New Year's. Summer is also a difficult time to interview. Early fall and late spring are best. If you have the staff to collect the data, you may still need a statistician to analyze the results or an EDP firm to process the information.