Everything is making me cry

Recently I’ve been feeling pretty down, and generally shit, and everything is leaving me on the edge of a break down ... stuff that wouldn’t upset people normally. Like, my boyfriend was meant to see me at the weekend but now he’s working, and every time I think about it I burst into tears! I should be happy for him, and I am, I have no clue why I’m getting so pissed and emotional at every little thing 😫 help me! Is it my pill ?