Anxiety issues

I have outrageous anxiety problems. I just worry and worry. My stomach is always in knots. If I do anything wrong at work (small things like texting or being a minute late) I worry I'll get fired. I'm always worried that my boyfriend and I will break up or that there's something I'm doing wrong I don't know about. I worry I'll fail my classes. All of this just bothers me all the time.

Does anyone else deal with this? Any advice? I just don't want my stomach to turn anymore!