Invisible barriers & reload spawns player mid air

Yesterday my world started acting up and as I was exploring I was running into invisible walls that I Couldn't get through. Because of this issue I kept reloading my game and all of a sudden I spawned mid air and fell straight to my death losing all my armor and gear. Also the phantom mob was glitched a few times as it would get stuck in the high up in the air on my screen but still be able to attack me and theres nothing i can do to fight it cause its invisible but I can hear the phantom's sound when it attacks.