It certainly does appear as if your son does have pinworms. The usual treatment is a single 5ml dose of Vermox syrup. This is a very effective treatment but usually takes at least 3 days to work. The dose can be repeated once after 10 days and then once a month for 3 months. Each time you only need to give one 5ml dose of Vermox syrup. Make sure that your son is not re-infecting himself by keeping him out of sand and sandpits in particular and washing his hands well after he has been playing outside.
His head nodding is another problem which may be due to an eyesight problem. He should be seen by a children's eye specialist.
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