I fell down my stairs 3 days ago and banged my head on the radiator. i still have a painful headache, feel dizzy, sick and very tired. concussion?

Seek medical help: The common symptoms of a concussion are headache, dizziness, and feeling tired. Additional symptoms can include memory problems, nausea/vomiting, trouble thinking. The rationale for additional evaluation is to ensure that there is no structural damage such as a blood clot or skull fracture that might need neurosurgical intervention.

Depends: The effects of concussions can vary and be unpredictable. It depends on the severity of the injury. The symptoms can include headache, dizziness, vision change (blurred vision/ double vision), nausea/vomiting. If your symptoms or headache are severe, or if you have a loss of consciousness, you should get evaluated immediately.

Symptoms fit: The symptoms you are describing are certainly consistent with concussion. Other symptoms of concussion include: fatigue, vision changes, irritability, feeling slowed down, difficulty sleeping, feeling emotional, sleeping more/less, memory issues, mentally foggy. Typical concussion improves in 7-10 days with rest from stressing the brain & body. If symptoms worsen or any concerns, I'd seek eval.