I felt exactly the same, when I finally got the keys I basically walked into the house, switched the heating on and then burst into tears! It's a very stressful business, you don't realise how stressful until it's suddenly over and the relief hits you.
I organised the broadband (plusnet) to be installed on Thursday morning, the day after I get the keys.
I'm moving from apprehension to dread now. Everyone keeps asking if I'm excited, I haven't been excited since the offer was accepted, it just feels like a massive burden now.