Yes it's called cognitive therapy.
So on one side write down what happened on the other how that made you feel.

Then comes the hard part trying to work out why what happened relates to that particular emotion.

Your dreams will be affected I am sure, this is just yr subconscious trying to work out why you feel the way you do. Eventually in time you will connect a situation to a feeling along with a reason for the feeling.

ie you are in a pub and someone cracks a joke about hitting their head, you suddenly burst into tears, but realise this is because the joke connected to the emotion of sadness reminded you of your past experience with a TBI.

So, good luck, yes writing will work but if you get muddled you may need an experienced cognitive therapist to help you work out Why you attatch such emotion to certain experiences.