Crash Upon trying to enter a world. Post 1.2.1

After the "Better together" (yeah right) update came out I was able to play Minecraft again after being plagued with lag for over a month. but after going onto my survival world once, every attempt after that has lead to the tip screen and then crashing. The game closes completely.

EDIT:

Okay, this began as an issue prior to 1.2.1, and the issue remains. I cannot get onto any of my worlds without crashing.

EDIT: After a while I was able to get into more worlds again, but now the crashes have begun again.
As of 10/6/17 these issues remain.

Also, while I do not want to disrespect anyone, I am VERY angry at the way I have been treated from my previous experience. And I am angry now. I want closure. Prior, my issue was redirected to a dead thread where Inever got any response after asking the same question that I am going to ask now.

I do not want my thread to be closed without hearing that the developers are aware of the issue or have at least tried to fix it. While I understand that contacting a dev is difficult, I at least want to know that this information has reached them.

I would like to say Thank You, but I'm not sure if I can.

EDIT:

I AM F***** PISSED AT YOU PEOPLE NOW.