I would split up your extra work into a couple (or even a few) days. By doing this you can work on your weaknesses with the same intensity that you do your major lifts.
I always start with the largest muscle group first. Larger muscles are more taxing to train, so I hit them first when I'm fresh to get the most out of the workout.
I would consider taking some time off and just resting. No sense in rushing things which could lead to a serious injury. The weights will be there when you're ready. Health first.