I'd try to do a lot before starting meds.
Take the kid to the doctor and get a physical. Eliminate any medical condition. Then talk to the doctor and see what he/she says.
Next -- take him out and let him run. Wear the kid out. Many boys have a lot of energy and no where to get rid of it.
Second, he might be grieving about break-up and can't express it.
He needs to learn how to express anger properly. I suggest that you teach your kids when they are mad or upset to take a pillow and scream into it or hit it until they are tired. Make a game out of it. Let everyone take turns seeing how loud they can scream into the pillow or how hard they can hit it.
Develop a code-word for the family (let the kids pick it) that signals that child needs a chance to get alone and calm down.
My daugher used to get overstimulated and not be able to calm down. I used to have to sit her down and stand directly in front of her and hold her arms and say "BREATHE" and we would take 10 deep breaths together. Sometimes it worked.
At night, I'd use sleepy time tea and some bedtime music (there are many classical cds for sale) and read her a book then rub her back until she could finally calm down. I also tried LAVENDAR oil and put some on a small facecloth (very soft one that she chose) and let her breath that in.
When we had "monsters" I made a "magical" potion and let her keep it by the bed to "eliminate" any bad monsters. It was made with some lavendar and other essential oils and was diluted so it could not hurt the furniture. She sprayed it everywhere. She kept it by the bed.
I tried anything that anyone suggested. She still has trouble falling to sleep and she still drinks sleepy time tes and listens to classical music.
Try to avoid processed foods. Encourage him to let lots of fresh fruits and vegetables.
Many people think that the dyes in our processed food cause probelms.
Also, sugar in our processed food may contribute to his high energy.
Ask him what he needs in order to concentrate.
He might need something and can't tell you what it is. Make sure each child gets some special "mommy" time alone without the other kids. It might be one hour but that is HIS time and the other kids cann't come into the room. Then you do what HE wants for 1 hour. Do it for all kids. Then learn to take turns. It can be something silly like hot chocolate. My daughter loved to make "special potions" of many kids of liquid soap for her bath. It was cheap and easy and it ended bathtime fighting because she used her "potion" and no one else could.
To get her to eat, I began to let her season the food before we cooked it. She got to choose what we added or did not add. She really could season food -- even at 4! Again, it stopped fighting at mealtime.
Perhaps he needs a signal or a word that only the teacher and he knows that says "wow! calm down". Then he might feel special if he has a secret with the teacher.
Many of my daughter's teachers wanted her medicated.
Finally her 4th grade teacher said take her off all meds and I'll work with her. The teacher was wonderful and taught my daughter how to work with her disability. This teacher had problems when she was in school and she was able to perform miracles.
My daughter eventually developed a way to study that worked for her. She had to sit on her bed with the t.v. going and all the lights on in her room with the door closed. Since she was making A's I learned to trust what she needed. I don't know how it worked but somehow it made her be able to study for school.
One temp. teacher in high school joked about my daughter to the entire class that she had a learning disability! I had just gotten out of the hospital from having surgery and looked like hell and I ran to the school. I was livid! My daughter was soooo happy that I showed up and she just hugged me for soooo long. That was all she needed and I never had a bit of trouble with the temp. again.
She's now in college and she still complains about having trouble studying.
After we had my daughter tested, my ex-husband went on medication and he began to read books. I never saw him read a book in the 15 years we were married. He has been on medication for years and he said it truly changed his life. He never knew that he had a problem!