Any advice for visual stimming

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My son is 5 yrs we have been doing biomed almost 3 yrs we have made progress but

still long way to go.. he has always visual stimmed., Throwing plastic watching

it fall ..bouncing balls etc Over the x mas he has taken to throwing empty

supplements bottles the louder the better .. I have tried treating for strep (3

months of zithromax) nil improvement valtrex famvir immunovir for viral,for a

year (nil improvement in this aera) Have any of you had success in treating this

issue . He has came on so well in all other issues but i have never had any luck

with his visual stimming he would do it all day every day if we would not divert

him.. Thanks for any advice Caroline