question: Hi Doctor,  I am a 25 year old mother. My husband and I live a healthy lifestyle. Go to the gym 3-4 times a week. For the past two days I've been feeling extremely weak. Dizziness, feeling cold, gas and today a little nauseous. I have no energy to do anything. All I want to do is rest. I have also had a little Sharp pain on the right side and middle of my chest. What can this be?