If you received a Rating Decision in the last year denying service connection, don't file a new claim. File a NOD. If you file a new claim, the effective date of the award is the date of the new claim, not the original claim. The VA has a duty to review your claims and the claims file for all potential claims. If someone could have reasonably seen an aggravation or secondary argument, the VARO should have developed that claim as well, no matter what you filed for.