Q: my photo stream not working after update to IOS8

You have probably enabled iCloud Drive on one of your mobile devices after upgrading to iOS 8. Then "documents in the cloud" will no longer work. Unfortunately, the upgrade to iCloud Drive cannot be undone. You'll have to wait for Yosemite.

See this link: Be aware, be careful, be prepared for iCloud Drive | TUAW: Apple news, reviews and how-tos since 2004

And this:  iCloud Drive FAQ

While you are waiting for the Yosemite release you could sync your iWork documents with Dropbox.

As to My Photo Stream:

The new Photos.app stores the photos differently. There is no longer a Camera Roll, and My Photo Stream is no longer visible as a separate album. You will find the Photo Stream photos in the "Recently Added" album.

See this Help text on how to access the Photos in iOS 8:

     Get help finding your Photos in iOS 8