Anxiety Tics?

Anybody else experience something call Anxiety tics? I don't have tourettes but as of 2 years ago, I began experiencing these involuntary shoulder jerks.

I had passed out in our family car, after spending the entire day walking through the heat for long hours and then standing waiting for a bus for about 4 hours. Eventually my body shut down when I got into our car. I was mumbling, short of breath, head dropping back, body weak.

About a week or so after that, I was having a break down while in bed trying to sleep; I was restless, frustrated, couldn't feel, my emotions felt off, I felt empty. I cried out for my mother. She sensed that my depression was coming on. She came to lay with me and that's when the jerks began.

Now this was 2 years ago. Since that night, I've been been experiencing it alot. It would happen once or twice very mildly, here and there, but later down that year when I began studying a new subject in prep for exams, it came on frequently.

With the shoulder jerks, it pulls my head in too, so when the left shoulder goes up, my head flings left; as if something tugs them towards each other. My mother got worried thinking I was having seizures. I tried researching it but kept getting results for muscle spasms that was nowhere close to what I was experiencing. After exam, it came lesser and lesser. Got it probably once every few months. So I assumed that stress on the mind and body was the cause.

But this year, its back more. It was creeping up. One or twice a week. Until last week it came on frequently. Harsh too. When it happens, my hand also flings out. It's like a freaking puppet strings is connecting my shoulder to my head and arms. Since I thought to be stress that time, I thinks it's that now. I'm studying a science subject and I think that no matter how much I try, the work is just not sticking. And exam is in May. So I think stress and anxiety is in works. I decided since it behaves like tics, that I search shoulder tics and there it was. It explained all that referred to me. It's called Anxiety Tics.