I think that you will find that the MS Hug is a "visitor" that will cycle through. That said, however, I would always see a doctor to make sure that you are not having any cardiac issues.
Due to the reason that the "hug" can also be an early sign of ALS, doctors will (should) test for ALS at the earliest. I know I asked this of my neuro and she told me that they test for ALS at the first appointment. If not ALS nor a cardiac event, then the direction would point towards MS.