I feel your pain 

I compassionately understand what you are going through and there may have been some times I have undergone the very same thing or similar.

Guy #1: That Brian dude smells so awful because being near him makes me sick both mentally and physically.
Guy #2: I feel your pain! I have encountered similar jerks like that and they make me want to vomit.

I feel your pain by Touche Touche! May 8, 2018

I can feel your pain 

Something you would say to someone in a deep and relatable situation, especially when they are referring to their past and you had a similar past or a different past but still felt the same thing.

Oliver: All of my life, I have felt like nobody has given me attention
Katie: I can feel your pain

I can feel your pain by Worse than JJ March 28, 2020