Hi,
When in doubt, check it out.

With the medications you were on, and are on now, I would tell the Neuro ASAP about the chest pain. Don't let them let it go. It must be checked out to be sure and have peace of mind too.

It is spasms of the muscle around the torso, or waist, some the arm or leg, but it is spasticity in it's worse form. It's called Banding, the Girdle, or the MS Hug. All names but mean the same. Some have it around the whole chest by the bra line, others only half way. Some all the time, others only some time. It varies.

Shingles acts the same too. So get checked. Good luck.