I just accidentally restored my new iphone back to my older

So I just finished updating the latest version of iTunes and I plugged in my iphone and it asked if i wanted to restore it back to my older one or count it as a newer iphone and without thinking I clicked on the first choice, i went on my iphone and all my contacts are gone and so are my photos along with some other things, and now all the old games and old photos from my old ipod is on my iphone, I really Really need help right now all my pictures are now gone, i had some really valuable and special ones in there too.It's pretty confusing with the new updated iTunes so i kinda need help, feeling so depressed and stupid right now.

Looks like you are using itunes to synch iphone and ipod. If you had synced and backed up your iPhone previously then your backup will be there in the iTunes.
When you are restoring a device, you are given the option of restoring it form backup of iPod or backup of iPhone.
Try restoring it once again with your iPhones backup in the itunes(considering you had it backed up previously).It should put your content back in the iPhone.

In case you had not backed up earlier then there's a chance of losing the content.
If that's the case, try goin on to www.icloud.com(I assume you were using icloud) to get your contacts and calendar events back.

If you haven't done any of the above things I. E. Not baked up earlier and not used iCloud then I fear your content Is lost forever.