Please do not self-medicate with any new drugs. Your worsening headache and new-onset vomiting are critical warning signs that require immediate medical evaluation. Taking pain relievers like Ultracet regularly for three months can cause "medication overuse headaches," which actually worsen pain. Furthermore, vomiting prevents oral medicines from being absorbed and can lead to dangerous dehydration. You need to visit a doctor or an emergency room immediately. They can safely administer intravenous medications to stop the vomiting, manage the severe pain, and investigate whether your anemia has recurred or if there is another underlying cause. Please seek professional medical care right away.