Edit page doesn't load…

Hi all,

I’ve gone through a number of posts on here which describe people having issues with the “Edit” page not properly loading but none of the solutions are helping!

Many say it’s an issue with plugins so I’ve disabled them all then re-activated, then completely deleted and removed them but none of this help!

A few posts say I should try updating my theme but I’ve done a lot of customisation to my page and don’t want to start all over again!

Can anyone help or put me in the right direction?

It’s unbelievably annoying!

Also, a non technical response would be much appreciated because I’m an amateur!