Rapid heartbeat with dizziness and weakness in the limbs, if these symptoms occur at the same time every time and are not very serious, consider that it may be caused by a state of anxiety. It is necessary to identify whether this situation occurs every time when you are emotionally stressed or have something important to do. If this is the case, it is recommended to find a psychiatrist or neurologist to help identify it. If the panic is more serious, or there is indeed weakness in the limbs, unable to walk, unable to hold things, you can find a neurologist to help identify whether there are other, such as muscle disease, neurological diseases caused by.