Sorry that this is a consideration, but completely understand. From what I've read, it looks like it could take 5-6 months to have a claim processed. GWA is absolutely right...the monthly amount you receive is based on what you're making when you file the claim, so it's best to file it sooner than later. You don't have to stop working while you wait for your claim to be processed.
There's alot of info online, and you can even file the claim online. Some people use attorneys, but they take a chunk o' change. You should be able to do it on your own, since your MS is a pretty obvious disability.
This isn't a forever thing, Lew. Remember that! You could take disability for awhile, until a med works for you or they get the kinks out of the autologous stem cell/immune ablation stuff. Jeff's got his eye on that prize.