Your options will depend on the wording of the settlement. If the settlement represented a full and final release of all of your claims, you may not be able to get more benefits unless you can argue that the change in your condition is a new injury. If you did not sign a full and final release, however, you may be able to reopen your claim. You would need to present medical evidence on the worsening of your condition, as well as meeting procedural rules for reopening a claim.