Omg! I went through the same thing. I sustained a concussion 5 weeks ago in a rugby match. The first two weeks especially I was super emotional. I'm usually VERY in control, rational, cool as a cucumber type of personality.

After the concussion though I found I was super expressive of my emotions and felt very loving and compassionate all of the time--just way more than normal. I'd also just start to tear up or cry for no reason. It would feel like I'd get a sudden surge of emotion and just cry. I wasn't sobbing. I didn't feel depressed or sad. It was just a pool of heightened emotion.

I'm pretty sure it was all symptomatic of my brain just being impaired after sustaining the trauma/concussion--though it was a fascinating thing to experience. Now the hyper emotionalism is wearing off and I am just finding I am WAY more irritable.

I just look at all of this as symptoms of the concussion--just like the headaches, dizzyness and nausea. It will get better eventually. Don't worry!