I need answers: chunks gone

Okay so I LOVE minecraft and this rating would be a 5, however I am having problems in my survival world. When I updated, a ton of the worlds chunks started disappearing, taking a village, my nether portal, and the chunks near my industrial district are fading, which scares me because Ive put a lot of work into it. I jumped in the hole and fell into the void, so all of the chunks are gone, not invisible. Would someone from the Mojang team please help me, as I really dont want to lose my creations. ? I have a picture of what I am experiencing, if that helps...

Fhisjdhushxjh about Minecraft: Pocket Edition, v1.0.4