Hi and Welcome. My Name is ***** ***** I look forward to assisting you today with your question.
iPad 2 is very old and it always has issues with iOS 9, but it is recommended to do an fresh install of iOS 9 instead of upgrade. You need latest iOS for properly syncing with all devices though. There is no way to go back to iOS 7 now. Sorry
I want you to backup all your important files from your iPad to your computer, and then install a fresh iOS 9 on your iPad from iTunes on your computer. This will improve the performance of your iPad slightly and solve some issues. I will send you the instructions.
Do you have access to a computer there ?