Cabin altitude is about 8,000 feet MSL (Mean Sea Level), so you will become more easily dehydrated. You may want to consider upping your water input - in Business or First, that's easy, but in a busy Economy cabin, you may want to buy bottled water airside before you board (or take an empty bottle through security and fill it airside).
For morning or even motion sickness, most aircraft have "burp bags" in the seat pocket in front of you (where also dwell the safety information card, etc.)
There is also plenty of information (even reliable information
) available online. "Here, let me Google that for you"
click here reveals information from the Mayo Clinic,
www.pregnancy-info.net, etc.