Screen Issue Macbook Air M1 2020

After upgrading to Monterray in August my Air immediately started having screen issues. A long band of darker shade on the left side of the screen encroaching about 2 inches. Displays on all webpages and in light and dark mode. The screen flickers uncontrollably, and suddenly parallel lines flicker in and out. This disappeared after I restarded and turned off my mac and left it off overnight and I had zero issues until yesterday when the exact same thing started happening again. It flickers even when I watch videos on VLC but less so, it flickers in dark mode but only in the lighter areas of the screen.

Anyone know what this is or how to fix it? I work online so it's diabolical and the mac is only 18 months old. I also am far away from my country of origin so cannot pop into my store and ask them to look at it without paying a fortune.

As you can see on the photo, the grey band on the left. What u cannot see is the relentless flickering.. the macbook has never been dropped or had any liquid spilt on it. EVer.