I suggest calling your doctors office. Its free, you can tell the nurse what is going on and ask if she thinks you should come in to be seen. Maybe even mention that you are overweight but are pretty sure its not due to your size because you have been the same size for so long and not had the issue before.
That way, you really get an idea of whether or not the doctors just going to shrug it off without having to shell out the money for an unnecessary appointment.
I have, in the past, had to call the doctors office countless times with similar questions and find the nurse usually (even if she has to consult the doctor an call me back) has the best answer on what to do... be it to wait it out for x amount of time longer, just to be sure... or even the extreme of going to an emergency room because its probably worse than what I think it is (that's only happened once and thank goodness she suggested that as it did end up being an emergency!)
Artist, photographer, stay-at-home-mom and Marine wife. Mom to 4; a boy and three little girls.