* Reading Nonviolent Communication, by Marshall Rosenberg. I have very low native empathy, and the techniques in that book have helped me learn to understand and interact better with more emotionally-responsive people. It also helped me learn to recognize my own emotions better.
* Therapy. Finding a good therapist is hard and they are definitely not all good, but it can help a lot when you do.
* 2.5 grams of daily fish oil seems to have actually increased my emotional response significantly. Totally anecdotal, and not why I started taking it, but after about a month of that dosage I started to notice a difference. There's some evidence I may be on the autism spectrum (high-functioning, once known as Asperger's), so this could relate to that.
* Consciously taking breaks throughout the workday to pause, stretch, and think about what emotions I'm feeling and why.
I hope some of that helps you.