My own biggest pains come from:
When someone who is supposed to care a lot about you constantly puts down how you feel, especially just because when your having a great day due to an amazing personal goal accomplishment. Also, when the people you make lots of time and consideration for give you no consideration in return or even appreciate that you are going out of your way for them.
Internal conflict is hard for me to deal with too, when I am trying to please too many people and also myself. For example: when my friend needs help (she is going through a divorce and has taken on the struggle of juggling her mortgage and bills herself) but I also need to have the freedom of my own space to concentrate on my homework. I feel a lot like I am letting her down as a friend, though she doesn't ever even hint as that as how she feels about it but I also can't afford the extra miles to drive back and forth to work and school from her house. I love her to pieces and she understands.
I know this may or may not have anything to do with all the things that come with PerC, but my love language is words of affirmation. So when people say mean hurtful things it stings a lot and makes me feel empty. Some people know how to strike a chord (^.^)
Oh I am very protective of my friends and family. When it comes to me, I can pretty much handle whatever they will dish out but when I see my friends or family hurting because of someone else, it really makes me feel extremely heated. It hurts me to see people I care about hurting.
I'm sure there are other things, but thinking about all the things that hurt is kind of depressing! :P