I have recently plugged my iphone 5 into a laptop which had an iphone 4s registered with Itunes. and I was looking to simply sync the music files to my iphone. However i have lost all my files and can not retrieve my Hotspot connection on the wifi page.

I have plugged my new Iphone 5 into a computer with itunes that had an iphone 4s registered with it. So when I plugged in my Iphone to the laptop I may have clicked something because I was looking to just add the music from the Itunes to my phone. I am a new iphone user and dont really know what I did and am seeking assitance because I have also now lost all my contacts (which have been synced entired to the laptop I lost all my original files and was synced the files from the other iphone4s users profile.) I have also lost the link to locate my personal hotspot when i entir the settings home page. I am wondering I have downgraded my phone or something. What can I do to get my personal hotspot back?