Irritated at work

I love my job but absolutely hate my boss... This rant might be brief because I'm actually in the work restroom as I write this, I'm in here for stomach pain that was actually caused by me stressing out because of the corporate manager for my department. So l've been at my job for at least 2-3 months now and although I'm still learning some things I pretty much know how to do my job nearly professionally and they have even discussed putting me on full time hours, anyway, suppose our store is holding a holiday show so everyone is kind of stressed about it, but long story short, imagine someone you barely know we're to walk into your home and tell you that your decorations and style are completely wrong and they start tearing your house up to "correctly" decorate it and you don't have a choice but to help them tear up your beloved home, this is how it feels to me, I've even been doing things by-the-book and I'm being told that it's all wrong and plus being treated like a dumb child because I'm a young adult. Im so sick of this, I just want to do my job!