World holes and game crash upon dying in Nether Portal

I caught fire in the nether then attempted to enter portal before dying. Died in portal before reaching Overworld. "Respawn" button appears but does nothing (only blinks)

What I expected to happen:
1. Click respawn and I respawn in the overworld.

What actually happened:
1. I am unable to click the respawn button
2. I go to the main menu, reopen my world and only the chunks in the immediate area of my bed are loaded. All others are holes. Pressure plates do not work, movement effects similar to typical server lag.
3. Game says it ran out of memory.
4. Game crashes with error report.
5. World still unplayable. Sometimes resembles what I said in #4, sometimes just void.