4yr old with turrets ..

Hello everyone im new to this forum

i took my son for his 4 year old check up today . the doctors have been running tests on him for a while now. He does this thing where he shakes his arms and hands (and feet is hes sitting) he hold his breathe while hes doing it and he is starting to make little weird noises while its happening. he cant help it and its getting worse.
first they thought it was autisim but hes way to smart and well behaved to have autisim they say. his doctor thinks he may have tics or turrets. i want them to do more testing tho

anyone have any thing like this happen to their baby before?