based on your symptoms and timeline, it sounds like she might actually be right. the reason she asked about tiktok is because there was an interesting uptick in FND/functional tic disorder during quarantine among teenagers, esp teenage girls (probably due to a stress response to the pandemic). she's not saying you don't have a tic disorder, but that it's not exactly like tourettes or other movement disorders and can't be treated conventionally. she's probably right in that deleting tiktok, even just temporarily, will help, but she should also be referring you to a neuropsychologist. they can help retrain your brain's response to certain stimuli that's causing the tics. if your neurologist didn't refer you to neuropsych, ask for a referral. at the very least, they can advocate for you if it turns out to be a purely neurological problem

The best way to get a accurate diagnosis is with a video EEG which can rule out epilepsy.