Sorry, I can't find any other expression. But I'll try to explain what I mean.
Imagine you have already suffered an unpleasant expecience, or at least you have been into a situation where you don't feel at ease. Later in life, you may say to someone who is experiencing that same process : well, I know how you feel because I have been there. "I have suffered it in my own flesh/skin ...." I am searching for a suitable expression/idiom. In Spanish we say "lo he sufrido en mis propias carnes" in case it may be of help.
Thank you for your help :-D