I have the same problem. I do not have any options under photos in iTunes. Just a sync button at the bottom right.
If you are using iCloud photo library beta, iTunes no longer syncs your photos between computer, iPhone, and iPad. You have to remove the photos from one device, for them to be removed from all your other devices. Is how it is supposed to work.
Now, if you are not using IPLB, and you still have a camera roll showing on your iPhone, if you are using Windows, when you connect your iPhone, Windows should ask you if you'd like to import photos. If you select yes, it copies all your camera roll to your computer's hard drive. You should select remove these photo's from my device to delete your camera roll. Then, in iTunes when you check mark, sync photos, you should be able to select the hard drive directory your photos are located at, and they will be synced to your phone in a more optimized size to help you save storage on your phone.
Then if you don't want these photos synced to your phone any longer, you have to move them from the hard drive folder where iTunes is looking at, to sync back to your phone.
I'm not sure if any of this helps, but this is how I've handled syncing photos in the past with Windows. I now use Macbook's and it's a more simplified process to sync photos. I've went ahead and switched to the iCloud photo library beta, and pay for 200GB a month so I can have all my photos and videos on all my devices and not have to worry about syncing any longer.