Entering the nether causes chunks not to load properly, stuck inside the nether

Hi! My name is Isabelle and I have had Minecraft PE for a while now and there has always been an issue with the Nether portal. Entering it is fine, but once I‘m in the Nether, only a portion of the chunks will load, the rest are there but are invisible. I am not able to properly break or place blocks or use any of the items in my inventory. The Nether portal will usually not let me come back through it, I can only walk around the Nether. Usually I save and quit my game, it reloads and I’m able to go back through the portal, but this time whenever I reload and try again, the Nether is still not loading and the portal won’t let me through, so I’m stuck in the Nether. Please help fix this bug! I would change the game mode to creative to try and fix it that way, but I’m on my strictly survival world and I was working for achievements.