Emotion is an integral component of my spellwork. As humans, we can not divorce ourselves completely from our emotions. I don't necessarily advocate supressing emotion during spellwork, but I do believe in channeling the corresponding energy in the right direction. Like I've said, I use whatever I can to achieve my goals. This includes using anger and even pain, if that is what is needed.
My problem is the emotions I am experiencing are not always mine. For example, I was driving home. It was a perfectly normal drive, not issues, just cruising along. I stopped at a light and all of the sudden my ears became to burn. I became extremely angry. I even started slapping/punching my own leg. Scary stuff, but remember, prior to this I was fine, not mad at all. The woman in the car next to me was not fine, however. She was yelling at her passenger. I don't know about what, but I know how mad she was because I felt it, literally.
When performing magic of any kind for another person, I have to work hard to separate my emotions from their emotions, because part of the reason the person has sought me out is likely my ability to help. I can't help, as in be myself, if I'm carrying their baggage.
Yes I pick up on other peoples emotions too. It does mess me up a bit at times