Samsung Galaxy S6 touchscreen in reverse


good evening all,

I'm hoping i can resolve this issue as its driving me insane.. This morning i had update appear on my galaxy for the SuperSu app and i clicked to install update, everything seemed fine and i was asked to re boot device (biggest mistake ever), i re booted but the phone then for the next 6hrs was stuck on the samsung logo screen, i tried the holding of the 3 buttons and rebooting again and again, but nothing. Then all of a sudden it booted up, it was booted in fresh start mode. Wasn't that annoyed as i had only installed a custom rom on it the weekend, so i had hardly anything on it. My problem is now that my touchscreen has reversed itself and my buttons at the bottom the return and most recent apps no linger seem to work. I've looked about and can't find anything apart from *#2663# method on the dialer which doesn't work. I've re rooted it but its still the same. Its driving me crazy
i used odin to root with twrp and flashed the Nougat 7.0 Nemesis rom

Please i'd appreciate it if someone can help me

thanks in advance