Hi Kate and welcome to the forum...wish it were under better circumstances. When you sync'd your iPad with iTunes, was it on the same computer that you originally used to set up your iPad? Also, under the "Photos" tab, did you have "Sync Photos" checked? Generally you would have to confirm a pop-up warning that all data or photos will be deleted before they will be removed. About the only time that would happen is if you tried syncing your iPad with more than one computer.
At any point did you run a backup (via iTunes on any computer) while the photos were on your iPad?
Let us know a few more details and hopefully we can help.
There is one App that claims to be able to recover lost photos on an iPad but it looks like it only works if you backed up your iPad at some point. I've never used it, but it might be worth a look:
http://picturescueapp.com/
Also, feel free to use the forum's search feature (upper left-hand corner of every page) to find more answers to any questions you may have.
Check the links below my signature to get the most out of our forum as well as your iPad too.
Best of luck and we'll look forward to hearing back from you.
Welcome again!