Feeling Overwhelmed by Friends' Problems

That is the worst feeling, when people are hurting, and you can't do anything about it. But you should remember that you are helping just by listening silently. If that's all you can do, then set it aside until you CAN help. Don't be afraid to put yourself first though. Your friends should ask if you're in a good space before they dump their problems on you, and if not, then say no, and they'll respect your feelings too.