General Tip
Eating better and doing some exercise will have positive effects on your wellbeing. Try to cut out as much sugary foods and beverages as you can and eat more nutritious foods like fruits and vegetables. Also getting in a multivitamin daily will help with your mental health.
Anxiety Management
To get more control of your anxiety try breathing exercises that will help you calm down. This will put your anxiety on the backburner and you can de-escalate your anxiety. Another way to do this is by putting cold water on your face or take a break outside in order to calm down.