Screen Glitching After Latest Update - Help Needed

After the latest Minecraft update, my screen sometimes glitches and flickers. Also, sometimes when I manage to get in, the screen is split into three parts. Please help me.. You might think this has happened before, but it was working perfectly fine before this update.. Save my 20 hours of progress ㅠㅠㅠ I'm desperate ㅠㅠㅠㅠㅠ