I'm sorry to hear about the pain you're experiencing in the upper part of your head, especially since it worsens when you bend your head backward. This type of pain could be due to various causes, including muscle strain, tension headaches, or issues related to the neck or spine.

Here are some steps you can take:

• Avoid movements that worsen the pain, such as bending your head backward.
• Apply gentle heat or cold packs to the area to help relieve discomfort.
• Maintain good posture to reduce strain on your neck and head.
• Over-the-counter pain relievers may help, but only use them as directed and if you have no contraindications.

However, because your pain has lasted for two days and worsens with certain movements, it is important to have a thorough evaluation to rule out more serious causes such as infections, inflammation, or neurological issues.

Please consult a neurologist or a general physician promptly to get an accurate diagnosis and appropriate treatment. If you experience additional symptoms like fever, neck stiffness, weakness, numbness, vision changes, or severe headache, seek emergency medical care immediately by calling the emergency number provided.To narrow down potential causes, we will need some more information.I understand you've been having pain in the upper part of your head for the past two days, and it gets worse when you bend your head backwards. To give you the best advice, could you please tell me your age and gender?