Thank you for your query on Healthcare Magic.
Breath holding spell will have a typical presentation with a preceding precipitating factor making the child disappointed.
The event will be like this in breath holding spell :
Taking off a toy from child or pinching leads to excessive crying followed by stopping respiration followed by cyanosis
followed by stiffness
Whereas in seizures the onset is unpredictable and usually it wont occur with any preceding event.
As your child has been examined and evaluated by a Pediatric neurologist
and advised medication for seizures, I advise you to continue the medication.
With your description it is looking like seizure only.
Don't afraid of the side effects. If you are more concerned of the side effects be in regular follow up with the doctor and do investigations for liver
function tests at advised regular intervals.
Don't stop valparin without your doctor advise as discontinuation will lead to fits
some times uncontrolled leading to continuous fits.
Hope I have answered your query.