I work in clinical science. I wrote my PhD quite a number of years ago. It was not easy but I got there in the end (English is not my first language). After that I got a good number of papers published, but even when I was first author I think I never wrote them 100% on my own as my previous PIs wanted to be highly involved (or didn't trust me!)
So in summary, I am writing this paper now and I want to cry because I realise I just do not know how to do it! I just cannot find the words.
I can do the intro, methods, results...it is mainly the discussion that paralyses me. This is also my first paper in this new job and I guess that also makes me doubt myself a lot.
I am usually good at re-writing stuff or correcting other's work, but the blank page... 
Any advice will be greatly appreciated!