I can see that you are very concerned. Before any medication will be prescribed, a good assessment is absolutely essential. I suggest an educational psychologist or an occupational therapist for this. I would also advise seeking therapy if your son was very traumatised by the divorce.
After these assessments you can consult a Paediatric Neurologist or your Paediatrician, to discuss the possibility as well as the pro’s and cons of the medication.
If the diagnoses of ADHD is correct, the right medication will turn his life around!! It is also important to cut refined sugars (sweets and cold drinks) as well as preservatives out of his diet. Supplements of Omega 3 and Omega 6 fatty oils, magnesium, zinc and B vitamins are important as well.