My iPhone 7 is running ridiculously slow, a lot of unknown errors occurring on all apps, I have went through and manually deleted a lot of things but it is still running slow?

Too little information and too many unknowns to offer much assistance at this point in time. We also don't know what all you have tried to resolve this yourself other than deleting apps. However, see if the following can help:

• Perform a "forced" restart. Ref: Force restart iPhone - Apple Support
• Reset your phone's Wi-Fi settings: Settings > General > Reset > Reset Network Settings
• Perform a "Reset All Settings" reset: Settings > General > Reset > Reset All Settings
• Reset your phone to its factory default settings: Settings > General > Reset > Erase All Content and Settings (Note: The following will erase all of your data and media and resets all of the iOS device's settings. You will need to restore it from a previous backup from either iTunes or iCloud.)
• Make a Genius Bar appointment at your local Apple Store or take it to an Apple Authorized Service Provider.