Issue with Nginx using cloudflare Flexible SSL and CORS

Hello ! I have a Nginx + Php-FM + Redis + Cloudflare Server setup . Currently struggling with the following issues : 1) I have a CORS issue and even though I added all the headers and tried them in different sections, I still get Access-Control-Allow-Origin errors ! This is using Flexible SSL on a wordpress website, which previously worked without such issues on Apache + Nginx setup with Flexible SSL as well . 2) If I try to use Full Certificate from Cloudflare instead of Flexible SSL (I already downloaded the CF generated certificate) I get a 404 error to website . Fixing this should also fix the first error about CORS, since that happens mostly with Flexible SSL . Need this done within 2hours if possible , should be fairly issue for those who have a lot of experience with Nginx . Please don't bid unless this is your main area of expertise ! Should be fairly easy for someone knowledgeable about my setup .