No pain, no gain. When I experienced these symptoms, I went triple dose on my treatment. You've got to be willing to hit it hard. These creatures have evolved, and will evolve. That's why they have survived hundreds, if not thousands of years in humans. Hit it long, and hard. Don't stop even if you stop feeling these symptoms. It's just the beginning.
Make sure you've eradicated them without a shadow of a doubt, and I'd also recommend chew up 5-10 cloves of garlic, and chase it down with two tablespoons of extra virgin olive oil, two to three times daily for at least a month. Sure, it doesn't taste great, stings your mouth, and you'll smell like a garlic bulb, but what can be worse? Would you rather, the parasite win this battle? No. Remain strong my friend, and Good Luck!