Well Dave, first let me say, Welcome to NeuroTalk
Now to disagree with you
Some pain associated with MS CAN be treated long term with meds, some pain cannot, and some pain leaves as mysteriously as it came. Depending on the location of the pain there is absolutely NO way to "work" with the pain - movement, tensing, elevation, ect.
Exercise/physical activity are known to be beneficial for pain and in general beneficial to MS. However, you can do everything that has been suggested and it won't make a difference for some types of pain.
With MS pain can happen anywhere in the body and unfortunately, sometimes there IS NOTHING you can do about it. There can be times you have to adapt to the pain, LIVE with it to the best of your ability AND not let it interfere with your life - hard to do but possible.
There is another option for some types of pain - heat.