If you think of the newest Pixar movie, INSIDE OUT, you have to be the person in charge of that computer board the emotions are working with.
Well suck it up. You need to do what my daughter's riding instructor has said. "Put your big girl panties on and jump that vertical!" or in your case, get writing and quit listening to those emotions.
But how do you do this? You need to listen to your fan club. These should not be your editors or your agents on this one (at least not necessarily). These are the people who think everything you do is golden. Think of your mom or dad when you were in kindergarten and brought home that finger painting. They raved about it and put it on the fridge. Go to those people!
If they aren't around, go to your social media accounts and just scan through all of those people who have said amazing things about your writing. "I don't know how you write such great stories?" "I wish I could be like you." (or for you 80's movie freaks..."Ferris you're my hero!").
Now, if you are in one of those moods today, tell those emotions to get off-line because you have a darn story to write!