Hi, monkey. With the sx you're experiencing (including the Raynaud's) and the fact that there is MS in your family, a doctor should certainly be taking you seriously and doing all the necessary tests -- blood work, brain MRI (with and without contrast) to start. If they don't listen, find another doctor!
Please keep us posted and let us know if we can help with more information. MS is a very individualized disease and even when it runs in families, not everyone will experience it the same way. Good luck -- we'll look forward to your update.