I am the same way...I always feel like I'm over-reacting over every small thing and can cry at the drop of a hat. Unfortunately, I am unable to control my emotional reactions. I am also able to pick up on the slightest hint of emotion from other people. I'm more empathetic than anyone else in my close circle of family & friends. Whether this part is a bad thing, I haven't figured out yet. So far it's helped. But my over-sensitivity has made me look, in my perspective, a big cry-baby and a little crazy. It's even caused quite a few anxiety attacks as well. It's very difficult to deal with, especially at work when this is a huge issue.
Thank you so much for mentioning the title of the book your mother gave you. I will most definitely be checking that out!
If you ever need to talk, my ears are open!