I do know how you feel. It is often hard to switch off thinking, and unfortunately it is often the more negative things that rise to the surface. In many ways a lot of my paintings are unhappy - they help me measure my state of mind. Until I restarted my painting I used to suffer from very severe panic attacks, but then painting has helped me control them - the panic and negativity often ends up in the paintings - sometimes good work, sometimes bad but it serves it's purpose. Most of my darker work isnlt on DA. The anxiety is still there, particularly if things are going badly, but not as severe.