Hello. I believe I can be of help to you with this issue.
You appear to think the difficulties you have had throughout your life with school and learning situations are related to your head injury at age 3. Not knowing what the extent of the injury was, it is unclear whether there was lasting brain injury
. If your recall of events immediately before and after the event are accurate e.g., you recall your grandfather cleaning your head, it would not seem that a broad range of cognitive and intellectual functions were affected; you probably were knocked unconscious for a few seconds to a minute. Did anyone tell you that you were unconscious during this time or that you were diagnosed with a concussion? Were you up and about playing and at school within a few hours of getting stitches?
The pattern of problems you show certainly are worth having evaluated in more detail by a clinical or counseling psychologist who does academic and learning disability assessments. Your story would seem to possibly fit the diagnostic criteria for Attention-Deficit Hyperactivity Disorder, Inattentive subtype. Most children who have this disorder do in fact, have a history of a head injury though the vast majority do not. The area of the brain that is most often discussed as being important to ADHD is the prefrontal cortex, so if you received an injury above the bridge of your nose for example (lower forehead), you may have suffered reduced blood flow in the prefrontal cortex, which has been shown to correlate with severity of ADHD. But again, the vast majority of kids with this disorder have no head injury history.
This disorder is thought by some to be qualitatively different than typical ADHD in terms of things like: 1) far fewer problems with conduct problems, but rather, the child is characterized by being inattentive, daydreaming , being somewhat underactive compared to peers, being described as somewhat passive, apathetic, withdrawn and shy.
So, give your story, it would be well worth being evaluated for possible ADHD-Inattentive subtype. If you were prescribed a trial of medication for this problem, you would know within one day whether it was helping i.e., your thinking would be more focused and organized, your attention would improve.
With regard to your anxiety
over your Jan. presentation, you should perhaps get a friend or colleague to help you organize your ideas and sequence the presentation using an outline, then break the task of producing it into small, manageable chunks. Ask for lots of feedback. Start on the project now if you can, and work steadily on it for the next three months. I suspect that after you get the actual presentation outlined, you'll immediately start feeling more confident about creating each part of the presentation.
I hope this information is helpful to you. Let me know if I have overlooked any aspect of your question.