I stopped taking Setraline (Zoloft) cold turkey. I'm having negative side effects from quitting so abruptly?

I have been having massive head aches, and completely snapping at people for no reason. I'm always in a bad mood. Is this because I just recently stopped taking my Zoloft?
Update: I have also been really down lately because my boyfriend just left to Fort Leonard Wood, MO and I won't see him for 6 months. I am not feeling suicidal though. Is that contributing to my negative feelings?
Update 2: I am also leaving for Army Basic Training, and I am not allowed to bring them.
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