First off, I just want to say what a fanatic job you’re doing by looking into ways to help yourself or your loved one, even if it’s not ADHD, you are doing something to try and improve your family’s life and for that I say well done and you are on the right track to make changes.

Have a look through the below information and see if any of it applies to you or someone you love. If you do resinate with this information the very next steps are to contact your local doctor to discuss you concerns. (Always get a second opinion if you feel you’re not being understood.)
DSM serves as the principal authority for psychiatric diagnoses. treatment recommendations, as well as payment by health care providers, these are all often determined by DSM classifications. As stated within DSM-5 Diagnostic the criteria for an ADHD diagnosis to be made, the following will need to apply to yourself/child/loved one

1. Often fails to give close attention to details or makes careless mistakes in school work, at work, or during other activities
2. Often has difficulty sustaining attention in tasks or play activities
3. Often does not seem to listen when spoken to directly.
4. Often does not follow through on instructions and fails to finish schoolwork, chores or duties in the workplace.
5. Often has difficulty organising tasks and activities.
6. Often avoids, dislikes or is reluctant to engage in task that require prolonged mental effort.
7. Often loses things necessary for tasks or activities
8. Is often easily distracted by extraneous stimuli
9. Is often forgetful in daily activities
10. Often fidgets with or taps hands or feet or squirms in seat
11. Often leaves seat in situations when remaining seated is expected.
12. Often runs about or climbs in situations where it is inappropriate
13. Often unable to play or engage in leisure activities quietly
14. Is often “on the go” acting as if “driven by a motor”
15. Often talks excessively
16. Often blurts out answers before a question is completed
17. Often has trouble waiting for their turn
18. Often interrupts or intrudes on others.

There needs to be more than 6 symptoms of Inattention and/or Hyperactivity-impulsivity displayed continuously after 6 months at a minimum
These symptoms must have been present in at least 2 different settings such as home and school.

Must show that these symptoms are impairing the way in which the individual is functioning, whether it be in their social life, academic life, or family life
And that the symptoms that are identified are not linked to any other form of mental disorder or medical condition.

So, as you can see it isn’t easy to be diagnosed with ADHD, a lot of other conditions have to be ruled out and it has to be persistent and impairing your life. This is why it is vital to discuss your concerns with your General Practitioner/Family Doctor.

http://images.pearsonclinical.com/images/assets/basc-3/basc3resources/DSM5_DiagnosticCriteria_ADHD.pdf