That seems a little extreme given the degree of the issue as you describe it... also I am a little worried about how long a stretch of block nursing you are doing. Some moms with very severe OP may need to do it for longer, but most recommend block nursing for no longer than a week.
From what I understand, the issue now is that you are very full in the morning because baby suddenly jumped to a much longer no-nursing stretch and your body has not had time to adjust.
If that is the only or most primary issue, I wonder if it would be easiest to gently encourage baby to nurse once overnight to give your body time to adjust? And if baby will not, to hand express or pump just a bit (not to drain) over night.
More in block nursing:
http://www.nancymohrbacher.com/artic...=Block+Feeding