I am still managing to run and I'm eight years diagnosed, strongly believe my life style has been a saviour for me. I think Weight training is also essential, think it helps to keep gait problems under control to some degree.
I haven't had just as good a year, a number of flare ups and some long lasting but, each time I'm able to return to running, it's frustrating as it can feel like starting from scratch some of the time.
My Gait is certainly an issue as it does cause injury you have to pay attention to that and not push on to much, difficult I know, but you can end up with knee, ankle hip problems that are painful.
I did invest in a treadmill last year, which I have got use to using, I feel more secure and not as exposed as when I'm outdoors, but I'm determined to run for as long as its physically possible. Don't let people put you off running because you ahve MS as many will, I've managed for 8 years maybe not as many miles 10 -12 per week now, but I can still do it, Tortoise and the Hare is what I believe in, keep on running Happy Bunny!