My iPhone 6+ isn't responding anymore?

So recently my phone has had this grey flickering bar at the top of the screen, at first i thought it was a bug with the new ios 9 I installed so I downgraded, reset my phone and did the whole process, after like 2 hours later my phone started doing it again, so I pressed the home button and the power off button and i did that process to and it doesn't seem to go away, after like 2 weeks of it happening it became constant and it really annoys me now, I accidentally dropped my phone and it shattered and now the grey bar is repeatedly happening, so I was wondering, is it really worth the money to repair the screen if the grey are is just going to keep happening? I don't want to waste $200 for a new screen when I can get a new phone, but should i get the screen replaced?

1. Contact the Manufacturer

Before you attempt any DIY screen repair options you should check with the company that made your phone.
2. Screen Protector or Tape

If you can't fix your broken smartphone screen right away, there are some steps you can take to use the iPhone or Android with a broken screen. Assuming only the glass is broken, which means the screen still shows an image and responds to touch, you can use this as a stopgap until you can afford to replace the screen yourself.

3. DIY Screen Repair and Replacement

The cheapest way to fix a broken iPhone screen or broken Android screen is to perform a DIY screen replacement.

Buy the repair parts at the hcqs.us
This is involved, but it is not impossible. You can replace the screen on your iPhone or Android fairly easily using online tutorials. Sometimes you will need to replace the screen and other times you will only need to replace the glass.

Because…
[1] It was hit with a fall happen before.
[2] High heat burned that area before by accident.
[3] Cheap made screen from cheap brand phone.