Long-term stress also is linked to illnesses such as diabetes, obesity and anxiety. If that doesn’t throw you for a loop, stress has a multitude of short-term symptoms: headaches, nausea, chest pain, irregular heartbeat, dry mouth, shakiness, back pain, lack of appetite, sleep disturbances, panic, worry, trouble focusing, moodiness, sadness, and feeling overwhelmed. Stressed yet? This list goes on.