It sounds like the oatmeal is working for you, and you seem to have made the Primal transition in all other respects. Are you eating around 100g carbs/day? As long as you budget for the oat carbs, go for it.
But if you're having trouble shedding the pounds, the oatmeal will probably have to go.
$8 for an omelet in NYC is cheap. Just watch out for the soy oils, please?
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.