Hotbar, hand, entities and healthbar have dissapeared

I was playing randomly in my world and all of a sudden, my hotbar, healthbar and hand dissapear. I went to the settings to fix it but it didn't work. If I pause the game you can't see the pause menu options. I can't see my chests, pets, hand or the GUI. If I get out of the world, it resets, but then it glitches back after a few minutes.