Writing a dissertation is the most important task as it represents everything you did during your research journey. Unfortunately, most of us find it really difficult to do so!
I am so sorry to hear that you are stuck on writing. I know how rejection feels as I faced a similar kind of problem. What I understand is that you need to make a lot of changes and you only got a month. So, I would suggest that you take help from a friend or seek assistance from professional editors. You can also join a workshop! Where do you reside? Are there any writing institutes near your place?