A toolkit is a group of resources that you can use to help you manage the overwhelm of anxiety. Try a few ideas, see what works for you and what doesn't. Make a note in your phone so you can access them quickly. You may have different techniques in mind for different situations.
When you feel anxious, you will have a group of techniques readily available to help you to cope, until the feeling passes.
Be kind to yourself, you are not alone.
LLTTF Living Life To The Full - online courses - Free online courses covering low mood, stress and resilience. Work out why you feel as you do, how to tackle problems, build confidence, get going again, feel happier, stay calm, tackle upsetting thinking and more.
NHS Scotland - Self-Help Guide
Worry Tree - overthinkers toolkit