Having anxiety is terrible I'm shivering and feeling like I'm going crazy.

Out of nowhere the left side of my jaw tightened, my chest tightened and I felt lightheaded and my heartrate quickened. I'm freezing and feeling shaky. My breathing has gotten better but my jaw still aches and I still am feeling anxious. I've been trying to ground myself and visualize things that normally help calm me down. I usually envision my perfect hangout spot or if I opened my own business.