Hi Anna, it usually doesn't take too long... can't remember exactly but about 6 weeks I think, maybe less if you're lucky. YES a statement from MS nurse can make a huge difference. They contact your GP so if you haven't seen GP recently make an appointment asap and remind GP of your symptoms and tell him/her that you've applied for DLA.
IF you do get turned down, or don't get the rate you're hoping for, it's well worth appealling. Lots of people (myself included) get it on appeal (though lots also get it on first application so don't be downhearted).
IF you do need to appeal, come back on here and for advice as soon as you receive letter.
You will get a letter telling you if you've been awarded it and it will tell you what you got in each componant... mobility and care. The money will then be backdated to the date that you requested the forms.
If you get turned down, it will tell you why you didn't score enough to get an award (but fingers crossed you won't get that!)
It will also tell you how long you have the award for... it varies, sometimes a year, sometimes 2 or 3 years, sometimes 5 years and sometimes 'indefinite'. However, starting next year they start going over to PIP where we will all have to apply again.
It's very unusual to be called in for a medical... but on PIP I understand we will all have medicals.
Hope this explains it all and GOOD LUCK. Fingers crossed for you... but remember APPEAL if you don't get it or don't get high enough award,