When I was first dx (8/06) my primary pain was arm spasms and weakness. It was intense, but similar to you lasted in terms of minutes. My arms would start tingling (this was always my warning sign) then the weakness/heaviness would kick in, followed by tight intense painful spasms. I could not drive, wash my hair, write, etc. This would last anywhere from 15 - 45 minutes, then it would subside, I would regain the use of my arms and hands and then later in the day it would happen again, multiple times every single day all through the day.
So for me it was painful, I would not describe it as discomfort, just sheer pain and I have a high pain tolerance, but it was painfulllllll. I don't miss that symptom at all. Of course now it's my legs that do all that.. ughhhh.
Hold on my brother don't give up, hold on my sister just look up. There is a master plan in store for you if you just make it through. The best is yet to come!