"Layla… you… Do you have any remedy for this? And why the fuck is it affecting me this much? Did your master do something to me?"
Layla hmphed at his question before replying:
"If my master wanted to break you, you would have been certified idiot by now, Eren Idril. Try to remember, will you? I had already warned you not to get scared or intimidated when you go meet my master. Do you think I was kidding or speaking in euphemism?
The first thing you do when faced with someone who can use soul sense is to protect your soul from getting affected by it. You do not let your emotions make your unawakened soul vulnerable more than it already is.
My master didn't want to do anything with you. But her soul sense as a Sage was bound to affect you because of your breakdown there.
Your nightmares are because of the external influence you have on your soul right now. A residual influence, which should eventually vanish on its own.