@Georgeismydog I'm sorry to say that there may no point in looking to him for emotional support. Hope I'm wrong here, but if he's never been able to give it before, the fact that this great loss is happening won't mean that he can somehow break through to understanding that you need support and comfort. He may not be able to provide it.
He may be able to help in practical terms. But in emotional support, and from my heart I'm sorry to say this, you may be on your own.
If your husband is unable to handle emotion, looking for emotional support to him is going to make things worse not better as the sense of emptiness and disappointment as he lets you down will sting badly.
The best support may come from friends who were close to their mothers, and who have lost them.
Books can help at times, and writing things down, a day-to-day journal.
Talking to your mum as much as you can while she is able to. Store up the memories.
Possibly a forum on line where people are going through the loss of a parent they love - the people there might be able to walk with you, and you with them.
Thinking of you. Losing your mum is a time of great grief.