Have you looked into CBT? A lot of it is about re-programming your thoughts. The ones that run around in your head and trigger certain emotions. I find it very hard to stop them. But that is key, I read that emotions are an indication that something is happening. I think it is helpful to write down all the thoughts that are causing the emotions and then it might be easier to stop them.. or rewrite them in your head. This all sounds easy when i explain it, but it is something that I am struggling with. The trouble with having a strong emotion is that you feel it is justified and so you don't normally think to rationalize the emotion in that moment. But even if you do it the following day, it can help. It takes a lot of work.