Hi my son who is 8 years old nearly nine has developed a tic I think it is a tic he shakes his head a lot when we are talking if he's playing he also makes some facial expressions took him doctors they said gna do bloods and refer him to paediatrics Iv asked him about it he said it dsnt bother him and he has to do it im really worried about has anyone also experience their child doing this does it go away?