You can do it! If ever you feel overwhelmed or stuck, perhaps try sketching by only using what you feel on another piece of paper. Don't think about what you're drawing. Just let the pencil move through intuition. Have fun with it. This should help relax your mind and let your creative juices flow (:
I do that sometimes too! But I think the medium adds to my anxiety too. Cos I use oil paint on canvas. When I make mistakes, I need to wait til the next day (for it to dry) to be able to correct it so yah. I'm planning to exercise more on acrylic.