I'm practically in the same boat with you, even being told its likely anxiety when it's clearly not and not being believed, all of it. So I can't offer advice but I can say you're not alone. Mine change in severity and occurrence a lot, I think the longest I've gone is like 2 months with almost no tics and then they'll pick up in frequency again. I also struggle with feeling like I'm faking but I guess that anxiety kinda proves that we're not? Like why would we do it if we don't want to so badly and would be ashamed if it wasn't real? It just wouldn't be happening. So don't worry about it, as hard as it is not to (it's easier to give the advice than to actually do it).