Spitting and throat clearing

My 10 year old has had a nervous cough and clears his throat all the time. I thought this was just one of his tics . He has now started spitting. Inside it is into the sink but outdoors he is doing it onto the street and it often ends up on his school trousers or jumper. 

I spoke to the sendco and she said to take him to the doctor as it has been 2 years with the throat clearing. 

Do you think she is right and I should take him or is it just a sensory seeking thing ihe can't  help ?

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