The trembing feelings that your son has could be remaining symptoms from his GBS. The fact that he blanks out for a few seconds suggests that he has a form of epilepsy called petit mal or absence episodes. Please ask your paediatric neurologist about this as specific treatment is needed for this problem. I do hope that he is being cared for by a paediatric neurologist because his problems are complex. His light sensitivity is not something that he is doing deliberately and you must not under any circumstances reprimand him for complaining about it.It may be due to the types of epilepsy he has. In the meantime good sunglasses are certainly needed.
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