FWIW - my mother was diagnosed w/MS right around your age. It's been 25 years since, and my father has stuck by her side. all in all she has done well with the progression. Even though they had a tough marriage during the child rearing years (who hasn't ?), they stuck through it during my teenage years right after her diagnosis. I can say that there is a dependency there due to the MS that has placed a strain on their relationship. This has been the case for the past 20 years, and it makes my mother lash out periodically - but they've also found a way to make it work for them in the last 15 years.
Do you have legal representation? What does your lawyer say? Unless you've been the primary bread winner there is no way your H can avoid support payments. Full custody? on what basis? kids need equal time with both parents post divorce, and most judges are inclined to provide this.
With MS it is critical that you work on getting yourself to a mental state that minimizes stress. So perhaps a quick separation is best, but invest in a good lawyer.
Your H's actions are despicable and uncaring, I would expose them to his family and friends ASAP. It is one thing to ask for a divorce, it's quite another to be this uncaring, selfish and thoughtless.
