I have a green vertical line to the left of the screen running from the top to the bottom of the screen

It sounds like a screen problem.

I'd suggest that you make an appointment and have your device inspected at an Apple Store or AASP (Apple Authorized Service Provider) among this list:--> Apple – Location Selector

After checking it out, they'll give you all the available options.

Regards

Giulio

Screen failure, take it to the nearest Apple store for repair.