Hi! I'm so sorry! I want you to trust your instincts. What you are going through is not typical child behavior. No amount of reading is going to get you to the other side. Insist on an evaluation for ADHD or maybe even autism. Everyone told me my daughter was fine, and I recently found out she has dyslexia and very likely ADHD (she's 9). I questioned myself - thought her inability to learn was my fault.
Look up resources for testing at your local Children's Hospital. Persist until someone sees them.