Nehter void

I have a world in minecraft that I’ve created some years ago, I usually never went to the nether but after the nether update I wanted to check out it, but when I entered the nether it was just void, ai couldn’t place any blocks, so I couldn’t make a nether portal to go back home I also think that I fell from a really high distance from the ground, and first the color of the void was a really dark red, but then ai went another time to the world and void color was some kind of deep blue, please I would really like Mojang or someone could help me, I’ve put a lot of hours into this world!