Do I have a hysteria? Or what is it?

Ok, this is how it is: My mood swings from fake happiness to absolute destruction in minutes. When my girlfriend doesn't call me honey, sweetheart or whatever in an sms I become worried, depressed, highly insecure. I think about every detail of every word million times and I put paranoid explanations to my head. It's not just about her. Everything makes me weak, depressed and angry. I'll be fine for a while, then I swing back again. I'm thinking hysteria, because I just react so "hysterically" to everything. Cannot keep calm. Cannot say This is not worth it. I am getting crazy about things others wouldn't even notice. Before you send me to see a shrink, try to answer my question, please:)) Thanks!