First, massive hugs to you, my gorgeous friend
Those results really suck. I'm so sorry. DH must be gutted. And you, not far behind.

Secondly, highlighting a few things here...

The GP believes that it's due to my DH's chronic psoriasis. She thinks when he gets that under control, the count should go up.
I really think you still need to see that FS - too many unknowns in that sentence. Get the low down from someone who is 100% in the know (or thereabouts) - a qualified FS. GPs are great for some things... but maybe not so much for others. Not being disparaging to your GP at all, nor am I saying they are wrong, but I think you should still see the FS.

Are you going to keep the FS appointment? You did make one, from recollection?

And what is the treatment, for the eczema? Is there something he can do to get it under control, fast?

More hugs lovely