You can do this. It doesn't sound like you've been on ultracets long enough to where the wds will be that bad. I think it's great you are tapering and then next week, you will take it one hour at a time. Just get through the hours and then those will turn into days and before you know it, you won't even be thinking about drugs every single hour and every single day. Can you imagine going an entire day without even thinking of them?
It can and will happen. Just one day at a time and seriously, you will recover from this. I would consider this a MINOR set back and I do mean minor since you were not really abusing these. Really, it's not going to be that bad... You can do it and keep up the great job. Are you attending meetings, aa/na, anything? What is your plan for fighting cravings when they come?
Take care and keep us posted!