Dh did experience obsessive thoughts, anxiety and a level of depression due to issues with the birth of our son, ds's surprise iugr and his own anxieties about his son's future (worried excessively about his height etc) it was out of control and difficult for me to deal with; completely unrecognised by the hcps around us - they though I was being anxious when I yet again went to the gp asking qs on behalf of my DH. (I later stopped asking qs and would say, my husband is worried... I think it's fine.)
Dh thought he was being completely rational, as I was coping with motherhood I didn't tune into it till it was quite out of hand.
I think if my HV had asked my husband directly about any worries he had it would have been helpful or asked me if my husband was worried in any way.
Whatever that was it does need to be named. He constantly queried things and worried about things I hadn't thought of which put doubts into my head as I tried to work out answers or back up why my gut feeling was that this wasn't anything to worry about.
I found the hvs were overly focussed on my own mh - when I was once in tears about my Dh over-reacting to things (it was exhausting to try to talk him down and round and alleviate his concerns), they interpreted it as me needing to take antidepressants. This was not what I needed. Also, family kept reassuring me about things and not talking to him. I felt I carried his "over anxious parent" label as I was the one who saw all the hcps face to face.
I've since worked out my husband has certain triggers of anxiety relating to not having much of a clue about biology, a little OCD regarding bacteria etc (its rather erroneous though) and had severe PFB, especially around food. But that actually down plays how hard it was to live with him and reassure him.
If not PND, it was a type of parental anxiety. It only pops up now through him getting anxious about the range of foods our son may or may not eat; nutrition etc.
The big issue is that anxiety in some people, especially men, often comes out as anger which then creates its own issues. Hence why I think this really needs to be recognised and taken seriously.