Varies: There is no specific dangerous heart rate during exercise. How fast your heart beats with exercise depends on a number of factors, especially your conditioning. If you are healthy, a heart reate in the 170's or even higher may be ok and tolerated.
Motion sickness caused by video games, sometimes called simulator sickness, is caused when there is a disconnect between what your eyes are seeing and what your body is feeling.
Hyperparathyroidism can cause fatigue and weakness, increased thirst, impaired thinking, and bone fractures. Food poisoning can cause abdominal pain, diarrhea, nausea, vomiting, fever, chills, and weakness. Medication side effects include nausea, vomiting, stomach upset, weakness, dizziness, seizures, and more. Motion sickness is a feeling of queasiness or nausea caused by moving in a car, bus, boat, or plane. Carbon monoxide poisoning can be fatal, symptoms include headache, dizziness, nausea, and vomiting. Chronic kidney disease is a condition of the kidneys that can cause high blood pressure, fatigue, and weakness. Heat exhaustion causes intense thirst, heavy sweating, pale, cool, and moist skin, muscle cramps, and more.