Hoarding Husband

Katherine
So my husband and I recently moved house. And it was only when we moved that I realised how bad his hoarding was. He has kept 6 pairs of jeans despite them having gaping holes in the crotches; altogether he has over 100 t shirts alone, around 50 jumpers and over 50 shirts. He does wear some of them but a lot of them are in boxes that are taking up space in the spare room (which will eventually become a nursery). We moved in three months ago, and he hasn't even moved to unpack a lot of stuff because there is just so much!
He used to enjoy playing 40k, but doesn't now because he hasn't got enough time, but won't get rid or give away of any of the figures. There are five boxes in our spare room filled with randomly assorted crap relating to hobbies he's picked up and then gotten bored of and dropped. 
He won't get rid of anything, and keeps buying more stuff! He has an office packed to the brim with comics and computer tech, but won't sort through any of it to get rid of it. 
What do I do? The idea of tackling it on my own stresses me out so much but he just doesn't seem to be bothered by it. I gave him an ultimatum once after repeatedly asking him to sort them out, and I said I would give them if he didn't sort them out. And apparently that's incredibly unreasonable. 
Is it? Am I being unreasonable?