What exactly does takeoff feel like? First time flying and very scared of getting sick....help?

I'm flying for the first time next month and I'm really scared I'll get airsick. I hate rollercoasters, I don't like the feeling of coming off the ground and how your stomach goes up. A friend suggested I take dramamine before the flight, but I don't really want to be on something on the plane. I'm just afraid I'll be sick and have a panic attack in-flight because of my fear of flying. Can somebody explain to me the exact feeling of takeoff, and what I can do before the flight to calm myself down and not freak out when I get on? I'm excited about my trip, I've just never flown before.