Have you ever seen the spoon theory? Maybe it would help your husband understand? I used to use my own version of this (using measuring cups) with patients and families when I was working and several years later was happy to see it in the non-therapy world.

But You Dont Look Sick? support for those with invisible illness or chronic illness The Spoon Theory written by Christine Miserandino - But You Dont Look Sick? support for those with invisible illness or chronic illness