Well, first of all, I do sympathise. It isn't particularly pleasant to spend no time with your DH. It's also not great to see your DH so stressed out that you're worried for his physical / mental health.
I often think the money is rather a red herring when it comes to this kind of situation - money is supposed to buy quality of life, and if you are so busy earning money that your quality of life is lost, then you're essentially throwing your money away. Does your DH's career mean that you've stopped any kind of social life which isn't based on doing nice things for the children together?
I do think it's very important to remind yourself and him from time to time that he does have a choice, and that he doesn't have to have that job, or work those hours. I think people can come to believe that they don't have a choice, whereas in fact they are choosing to prioritise certain things (the role, the money, the satisfaction it brings, having the opportunity to do / buy / have expensive things) above others (having more time).
It's also important to remind him (if this is the case) that he isn't doing this for you - that you haven't asked him to work long hours, and that although you have benefits from it, you also have disadvantages. Again, I think people can start to think that they are working long hours for their SAHM / SFTM, who then grumbles about never seeing them, and begin to resent it. If you are willing to take on other options if he needs to stop work - e.g. by taking on a part time job, remind him from time to time that you could get by perfectly well without his money, and that he doesn't have to work these hours.
And you shouldn't feel bad about feeling bad - fine, you've got a fab, fit husband with a good job, a lovely house, lovely kids, an opportunity to go to University and a good sex life. That's all wonderful. But if you have no other adult to talk to, to relax with, to share your problems with, you can't mention it to friends for fear of seeming disloyal, and you have to organise every single thing because DH is busy working, life does become a grind, and minor things can be quickly blown out of proportion with no-one to share them with - it's like being a single parent, but without being able to invite anyone else back your house because the noise of conversation would disturb your DH working.
Hope that's of some vague help - as you can probably tell, I'm in the same situation, and it's pretty grim. My dad always prioritised his family over his career, I'm used to making do and stretching the pennies, and this is what I would have preferred. Oh well