I have cared for several hamsters while growing up and as my girls were into having pets when they were young. The only exercise a hamster gets is a wheel in their cage that squeaks while in use. If you have ever watched more than one hamster sharing a single wheel you will notice that at any given moment one hamster will attempt to get on only to be thrown off continually, only to try again, over and over. 

MS is like that. I get on that wheel every day only to be thrown off at any given time as a new or worsening symptom shows up. I am persistent like that hamster, trying desperately to stay on the wheel and live my life regardless of the hold that relentless wheel has on me. And maybe, just maybe, the door to this cage will be opened and I will be free.