Dawn
I think you are wise to consider all possibilities and certainly with eye blinking and a vocal tic, there may well be TS or a "transient tic disorder"..the latter being failry common in kids and caused by a variety of issues

my son manifest his tics around age 4 with eye rolling and blinking a a squeaking noise and we had all kinds of dx, ranging from possible brain damage to optic issues, but it wasnt until aged 10 that a savvy developmental pediatrician dx him correctly with TS

do stop by the TS forum here too if you would like some input from others on the tics aspect

all the best to you and I hope you find clear answers and effective treatment
Cheri