How difficult for you - the sleep deprivation must be awful!

My DD went through many similar stages and it nearly broke me!! As someone else has said I think in part for us it just became a habit - the screaming became a habit and me going insane trying to console her became a habit. I resorted to contolled crying which I never thought I would do. But you know what? It worked!! I found it worked great for a while but then slowly the habits would reappear and I would have to go back to controlled crying. I know it sounds harsh and may not be something you want to engage in but the way I looked at is was, DD was crying/screaming anyway whether I was trying to comfort her or not. And to be honest, she is a lot happier in herself now that she understands she has the ability to settle herself during the night.

As others have also said maybe rule out other possible causes such as wind or food intolerances.

Good luck. I hope things settle down for you soon

Fi