Vocal Tics 4 Year Old

Hi.  Thanks for responding to my previous post.  What made me think my daughter (4yrs old) has tics was that it was repetitive, changing, and she seems to be very hyper when she gets going with the noise.  For example, yesterday when she came home from pre-school she made the clicking noise like 8 to 12 times in 2 minutes.  I asked her "Why did you make that noise?" and shee seemed completely unaware she was doing it.  If it were self-soothing would she be aware of it?  Also, she has had some strange behavior lately.  The other day, she took off her shoes and socks and started to lick her feet!  I told her she shouldn't do that, feet are dirty ahd have germs.  I have seen her lick her finger then rub the wet finger on her arm or leg.  I'm not sure why she does this.  She is an only child so I tend to over-analyze things she does, but because of the DX of apraxia I worry she may have some other conditions as well (comorbidity)  - TS, ADHD, SDI.  and YES, I am a worry wart! Thanks for your help.