Whenever I go underwater, my screen becomes all white, any solutions to this? (No, it isn't my texture pack)
It's in your settings somewhere, I think it's something to do with transparency, I had the excat same problem
Try turning off any additional Minecraft things, e.g hacked clients, shaders, resource packs. Otherwise this may be a Minecraft associated glitch and may be worth talking to mojang, - Herpy
It's probably a settings problem, like others have said. Have you tried logging on on another device(computer, laptop etc.) to see if you still have the glitch?