in the past six (?) months my anxiety has gotten progressively worse.  i was diagnosed with generalized anxiety disorder. i have tried multiple different medications but haven't seen a significant improvement yet. 
i recently noticed that i have started experiencing this sort of tic? every time there is a loud noise. i kind of shiver and throw my head back or to the side. it also sometimes happens at random times, or when i'm nervous or uncomfortable.
i referred to this as a tic on social media and an acquaintance from irl got VERY upset with me, saying i was claiming to have a tic disorder, that i was self diagnosing, and that i am ableist.
is she correct? i thought that that was considered a tic, and that it was caused by my anxiety. am i wrong in thinking this?