Peanuts works well for me. But you have a eat a lot -- like a whole jar in two days.
Or, flax seeds. Eat a teaspoon of those three times a day for a couple days, then stop for a day, then start up again. It may take a day or two to work. Sometimes the flax results in smaller softer stuff more often, like several times a day with a little bit of urgency (not much). Not diarrhea or lose semi-diarrhea, feels healthier than that (sorry, gross).
No, they aren't exactly primal, but it's probably more important for you to be regular than to be strictly primal.
Lots of fat will help lubricate things.
Also, I would recommend cutting the vegetables and dairy for a while until you're back on track. Doesn't fiber strain the system? And cheese blocks me up too.