For one thing, I don't think you should allow yourself to feel so personally responsible for this. It is hindering not only your search for Alice but your ability to function. Take a step back and don't force yourself to feel guilty for all this.
I know this is a very stressful and heart-wrenching time for you. But I think you ought to relax and breathe as others are telling you.
It might also help if you try not to anthropomorphize your snake. For your sake, try to temporarily tone down the "If I had just gotten him a bigger cage..." thing. I think you and I both know that is a bit of a stretch - you could give him a mansion and he would still look for (and most certainly find) ways to escape. It has nothing to do with space.
I think you need to take a step back and stop tearing the house apart. He definitely will not turn up if you keep turning over all his hiding spots; he'll just move to yet another cozy spot.