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The disease can spread rapidly in areas with inadequate treatment of sewage and drinking water. The infection is not likely to spread directly from one person to another; therefore, casual contact with an infected person is not a risk factor for becoming ill.

A healthy way to loose weight by diet and exercise is to maintain the weight loss to 2-8 pounds in a month so as you do not develop weakness. If you are loosing more than that please modify your regimen and if it you are still loosing it consult a doctor 

Yes, stress can cause heart palpitations because when you are stressed, your body releases a hormone called adrenaline which makes your heart beat faster. But, it could be something else too like too much caffeine or alcohol, certain medications, asthma inhalers, dehydration and other health issues.....