- Racing heartbeat or palpitations
- Shortness of breath
- Dizziness (vertigo)
- Nausea
- Sweating or chills
- Shaking or trembling
- Changes in mental state include a feeling of detachment
- Numbness or tingling in the hands or feet
- Chest pain or tightness
- Fear that you might die
- Exercising on a regular basis
- Getting enough sleep
- Avoiding the use of stimulants such as caffeine