Re: what to do when your spouse tells you "this"?
I suggest a lot of exercise so he can burn off some of that energy. Seriously. Actually getting out and running, biking, walking, lifting weights, digging in the garden, home improvement projects, etc. Whatever he is physically capable of. Our bodies need vigorous activity, and if we aren't getting it we can feel unsettled.
Secondly, I would suggest making sure his diet is good. Cut down the caffeine. Try to quit the sugar. Eat healthy meals. He might have some generalized anxiety or depression which a healthier diet could improve.
Next, make sure he feels appreciated for what he does. I used to think of it as I was the "family mule". Everybody wanted something from me, but nobody ever wanted to do something with me. Everybody needed more cash for something. The more I made the less we had in the bank! So be sure your husband feels loved and appreciated.
The book "5 Love Languages" might help both of you. He may need words of affirmation.
Finally, I would find a way to reduce the demands on him somehow. Maybe it means having a good detailed budget so he knows where the money goes and he feels the purchases are mutually agreed upon. Dave Ramsey's book is a good one. Maybe it means you getting a job if you don't have one.
I think it is quite likely his anxiety is actually driven by his fear of being like his dad. He may be misinterpreting it. He thinks about the pressures of providing (which we all feel) and then he worries he might be weak like his father. He attaches his anxieties to the wrong thing. So perhaps he should see a counselor. His work should provide a free and totally confidential counseling service via Employee Assistance Program. It really is totally confidential, his employer won't even know he went.