Cannot load Minecraft PE on iOS.

I have not been able to load my game past the “PLAY” button or any other option on that screen (settings, achievements or market place) for over 3 weeks now. I cannot delete and reinstall without losing all my saved worlds and can’t seem to find a solution or help anywhere. 

Everything was running smoothly barring the occasional lag but now it’s completely unusable. 

Please respond asap.