A CT scan is not necessarily needed to detect a TBI. CT scans are not harmless, and asking for one before you have any idea if it is necessary or not is a bit much. There are a number of other factors in determining if advanced testing is needed aside from just hitting your head. Depending on several things, and the type of damage sustained from a TBI the damage may never show up on a scan.
I'm not sure what the doctors told you, but chances are you have a concussion. It is totally and completely normal to have a mild headache, be tired and be emotional while recovering from a concussion. A concussion is technically the non-medical term for what is medically classified as a "mild TBI". TBI is a very broad term. Most commonly you hear TBI when someone is referring to a severe injury, and concussion when someone is referring to a mild injury.
What you do need to look out for are your symptoms worsening or new symptoms showing up. Not being able to stay awake, a severe headache, vision changes, nausea/vomiting, fainting, or seizures are all examples of symptoms you want to look out for. If any of those do develop, go back to the hospital.
The other thing you need to look out for are your symptoms not going away. Even if they do, you should still have a follow up with your regular GP in a few days.
Also, avoid alcohol, ibuprofen and aspirin, which can all make bleeding worse.
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