You sound like a determined coper, but presumably you married DH because he knows you, and wants the best for you, so maybe you need to be a bit vulnerable and let him know how you’re feeling, without knowing how that conversation might end?
Even if you can tell he doesn’t “get it”, it’s still important he knows how low parenting is currently making you feel, as he might just be able to support you, somehow, in feeling slightly less alone and depressed at your situation. If roles were reversed you’d probably want the chance to try to support him.
I had a short period of depression (different issues) after my first, and found it extremely hard to verbalise, especially to my husband, so I don’t speak as someone who did this naturally. But I’ve learned over the years, for all his faults, he does really want to help and sometimes really can, often unexpectedly.
Sending love - I know the feeling of just wanting to enjoy the kids, but not being able to. It’s hard.