So yesterday my photoshop was working fine but then saw I had an update for Photoshop CC 2018 so I updated it but then it says I have a seven day trial. I don't understand since it was working fine yesterday. I even got an email on the 19th that says for me to just log in and update to access the new features.
Could you please try updating to Photoshop CC 19.0.1 and let us know if it helps?
Please open the creative cloud app then click on the 3 dots on the top right corner & choose "Check for updates".
You also might try: sign out, restart your system, sign back in.