30 days of indiscretion, followed by 40 days of straight-up blood-sugar bombs? You'll just hurt yourself even worse.
The best way to get back into primal is to get back into primal. If you feel the need to get radical, try a Whole30 or a Leptin Reset.
5'0" female, 44 years old. Started Primal October 31, 2011, at a skinny fat 111.5 lbs. Low weight: 99.5 lb on a fast. Gained back to 115(!) on SAD chocolate, potato chips, and stress. Currently keeping food tracker.
I (try to) follow by-the-book primal as advocated by Mark Sisson, except for whey powder and a bit of cream. I advocate a two-month strict adjustment for newbies. But everybody is different and should tweak Primal to their own needs.