I can't remember where I learned this, it could have been while I was on the ward doing one of their courses.
When that horrible anxiety starts sit in a comfortable chair or lay on the bed on your back.
Imagine what colours the anxiety reminds you of - for me it's very dark colours, greys, blues, purples, muddy browns and black.
Then imagine what colours feel good and cleansing to you - for me it's sparkling silver, white, aqua and light blues.
Breath in through your nose and make su