Instant Damage Bug When Towering Up In The Nether

I’m so mad at Minecraft right now. The instant damage glitch happened 5 times in the Nether in my world, and the 5th time it happened just killed me. When I was making my entrance/exits for a Nether Fortress and a Huge Lava Pool at the bottom, I was making the way up and down and all of a sudden, out of nowhere it damaged me a small amount from just towering up with nothing attacking me. Not even any Ghasts or Blazes, since I was playing on Peaceful in the Nether. Then I continued to tower when I was at full health, it happened again but stronger damage I took, 3rd time was more stronger. And then this day after the last time I played Pocket Edition Minecraft, the same glitch happened 2 more times from the spot of the Huge Lava Pool at the bottom of my Nether portal. The 4th time was even stronger damage, and then the 5th time it happened, I died. There seems to be a towering damage bug that seriously needs to be fixed in the next update, massively. Don’t think I can deal with that anymore.