Hi there,
I am sympathetic - it can be alarming to have emotions spilling out all over the place. And at the same time it is not surprising - when you take the lid off, that all those emotions come up looking for attention and expression. So be patient and kind to yourself - it will get easier.
Two suggestions - one is give those emotions some space and attention to come up - tell a friend, write about them or have a cry without worrying about it. The other suggestion is to get a hold of the book "Mindfulness for Dummies". There are a lot of useful exercises in it about how to just be with yourself and stay present to what is going on as a way of calming down.