These issues have been covered many times. Deadlift programming is tough in that it destroys ability to do much else and it takes a while to recover from. For me, I have a squat priority day and a deadlift priority day, and I program from there. 5x5 on the DL's is not sustainable for very long as you will soon find out. Do some searching on the board, read Andy's forum, ready PP, there is TONS of information on this.
I do not recommend increasing volume on the deads for more than about 2 weeks - assuming you are doing anything that even closely resembles intensity for your capability.