Sufferers of anxiety or panic attacks will know the symptoms which occur before a panic attack When you become anxious it is natural for your breathing to become more shallow and labored. The other physical symptoms which accompanies shallow breathing, when experiencing a panic attack are: sweaty palms, dry mouth, racing heart, tense muscles, and dizziness. There are other symptoms as well but these are the main ones. Two main symptoms which can be instantly alleviated with breathing techniques are muscle tension and dizziness.