I would like some tips on how to calm quickly, because recently I've GAD and my anxiety rises when I hear, see things that relevant to the cause of it?

Anxiety. I most recommend a therapist trained in EMDR, for faster resolution of anxiety reactions to cues. It may not take very many sessions to resolve whatever the original stressors are. The brain does not break, it is just going to fight or flight when not needed. But if you have a special small object that helps you to feel confident or brings happy memories, have it with you as symbolic.