Why is my phone showing a black loading screen and takes me to unlock my phone as if i had my phone off. Also it deletes my message conversations and my pictures but slowly loads them back up again??

Read this article: https://support.apple.com/en-us/HT201656

Please check what's taking up the storage and delete it:

Settings → General → Storage & iCloud Usage → STORAGE - Manage Storage

You'll get a list of all the apps and how much storage they're consuming in descending order.

If your device is saying storage full and you've deleted content and it still says full, you will have to restore you device to factory settings and set up as a new iPhone. When a device storage becomes full and the issue isn't addressed right away, problems with the device can arise. To check your storage follow steps in this article Check the storage on your iPhone, iPad, and iPod touch - Apple Support. If you have been ignoring a storage full notification from your device, you may have to restore your device to factory settings and then set up as new iPhone to not have any problems with software in an iTunes or iCloud backup. Ensure any content you want to save is placed in the iCloud (not a backup) or imported into a computer. This article can help you restore your device. If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support

Your question isn't very clear.

Would be helpful if you can add screen shots or explain better what you were trying to do and what happens.

Has your iPhone been giving you a message that your storage is full?