It depends. You might get it or not. Some people are never altitude sick. Some are, when they are already on the altitude of few meters from the ground.
The lowest recorded case of serious altitude sickness (HAPE) was at 2500m in a climber in Japan. However, most people need to travel above 3000m and stay there for at least 12 hours before symptoms...
Living at sea level (Florida) and traveling to Colorado to ski I suffered constantly with Acute Mountain Sickness. I tried about everything, but this year I tried something new Oxygen Max it comes in...
This is from Yahoo health: Symptoms generally associated with mild to moderate altitude illness include: Difficulty sleeping Dizziness or light-headedness Fatigue Headache Loss of appetite Nausea or...