Internal cost estimates from 17 of the nation´s largest insurance companies indicate that health insurance premiums will grow an average of 100 percent under Obamacare, and that some will soar more than 400 percent, crushing the administration´s goal of affordability. New regulations, policies, taxes, fees and mandates are the reason for the unexpected "rate shock," according to the House Energy and Commerce Committee, which released a report Monday based on internal documents provided by the insurance companies. The 17 companies include Aetna, Blue Cross Blue Shield and