Thanks, Mast. I like your ideas - I have a relaxation app I haven't tried in a while, so will give the guided visual meditation a go.

I love the cartoon! Hehe

I know the feeling of wanting to take back an email I'd sent, but it's always worked out for me not being able to. It might be useful to examine what specifically your anxious about - the topic, a certain aspect of the letter, etc. Examining like that has helped me in the past.