It's a hard slog, and likely one you will have to endure mostly solo.
I have viewed my own mother cope with my father's illness these past 6 or so years, and for a few years, I lived-in to assist.
What you will find is like-minded people here (mostly women) and a vast amount of support and information. This is useful in that it give you solace that you are not alone.
It doesn't mean you will not have to put "real" things in place though to give you a life outside of just "caring".
How you combat this is entirely based on your own likes, experiences, skills, interests and such-like. Hobbies, interests, they may have faded or you may have to re-engage with some to help along the way. TV / DVD's is not a solution as this rots the brain, pardon the pun - I find TV like bread, it's a short term solution but ultimately a poor excuse for a proper meal, if you follow my drift!
I think maintaining a routine, adding interest as oft' as possible, and i'm talking about everyday, going on weekly visits places, coffee mornings, anything to get you two out and about. This becomes far more important over the years. Do not take the easy route, get out, even if it's just to have a coffee at Tesco's in the late morning.
If you don't look after you, your needs, you will not be a good carer; ergo you need to ensure things happen every day both for you and your husband. This becomes increasing difficult and complex the longer the disease takes. You might find your life seems to close in on you, some so-called friends drop away, so be-it. Keep all social engagements, seek out new ones, new groups to join, new activities to do, meals out and the like.
By putting these things in place early on will both condition other people at these places to your situation (this will make you more comfortable around them also) and your husband will be more comfortable returning back week-on-week (or similar) to these places and people. This will become ever more important as the years take their toll on you both, sorry, but best you prepare for the likely scenario ahead.
I hope this is of some practical help, I'm a bloke, so don't major on the whole "sympathy" stuff, for me it's the practical things I am more concerned with.