Primal Blueprint is not a high fat diet and it's not a low carb diet. Mark even had a blog post about this common misunderstanding a couple months ago. The misunderstanding is that the common wisdom is that your diet should be 20% fat and when you eat real food your diet will be around 50% - 60% and for some people even 70 - 80%. That's calories, not volume. The other CW is that you need at least 60% carbs in your diet or you'll practically keel over from malnutrition. Not true. Carbs are optional but you can still eat them and you SHOULD eat them (Mark says) if you are young, insulin sensitive and/or physically very active.
Just eat the real food. Have as much sweet potatoes and fruit as you like. If you are very active doing stuff like weight lifting you might try a little rice as well. And more protein might make you feel better as well. Stop drinking so much water. Read Waterlogged for more information (there are a couple of really extensive reviews out there that will save you the trouble of buying the book).
The acne probably cleared up because you quit eating wheat so don't necessarily credit the low carb.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 180 x 2. Current Deadlift: 230 x 2