Being in a family with a lot of interesting things in it's med history
(like cancer), I always get stuff checked out. My PCP understands and will rule stuff out for me to make sure it's the 800lb gorilla called MS.
My general rule of thumb has been: would I complain to doc about this before I had MS? If yes, he's my first call.
I will admit that it is something you have a tendency to learn over time and I'm still learning

. When I had electric shock-like pains, I knew that had to be the MS and directly called the neuro.