Packets have 1 gram carbs each. Tablets and liquids have zero carbs. Most healthfood store and specialty sections of large food stores. Grind the flax seeds in your coffee grinder. But keep it to a minimum.
Caffeine is a diuretic and causes water loss.
This can lead to headaches. Your own body will control intake. In most cases it will reduce your cholesterol. If you do see a rise, this may be brought back down with garlic and vitamin E supplements. The emphasis on monounsaturated fats and fiber in this diet are the key features to prevent cholesterol from rising.