Medical geneticist is definitely the avenue to pursue. Right now there is no way to know, but after doing a few DNA tests, they can give you really good accuracy. For both of those diseases, it's very possible that you could have a really low or really high chance based on those tests.
Good luck! Also, keep in context how much better it is to have WPW for example if you already know you have it in advance. It wouldn't be as bad for your son/daughter as it was for your boyfriend!