Positively negative...

House hunting sucks. Adult life-ing sucks. But it's worse when your partner is negative about the whole thing!!! He thinks we won't get approved for a loan, we won't find a decent house in our "price range" (I've found and seen 17, all pretty nice minus pink/blue bathrooms), and that something is gonna happen even when we move in. 
Like what the eff?! I love this man, I want to be with him, but if he can be slightly positive about this, God forbid we get married and try to have kids and I miscarry-extreme but think about it.. I feel helpless because I have had the rug ripped out from under me before, actually most of my life, and I do my best to stay positive anyway, and he doesn't see it that way. And it's rough.. 
Any advice for my negative Norman?