Soup gave you a good list of some coping strategies (healthy ones) to try. My list includes (some overlap with hers):

1. Journaling (number one way to articulate my feelings, including of the killing and maiming sort);
2. walks with my dog, preferably in as natural a place as possible, away from roads and traffic
3. Cooking, especially soups with lots of chopping, stirring, and then a h ealthy meal to share afterwards with my H
4. Reading
5. Going out to the movies or a meal with a friend
6. Knitting (you'd be surprised how much fun you can have with sharp pointy sticks
7. spinning (of the yarn making sort, my wheel and the feel of the natural fiber in my hand is hypnotic)
8. organizing something-- my closet, my kid's closet, the basement pantry, etc.

Also-- it is still under your control how you behave towards your BF. Being triggered is not an excuse to be nasty to the people you love. How about asking for support? Want him to hold you? Tell you a funny story? Watch a movie with you? Ask for what you want. He might actually be able to help you through this, but not if you mistreat him. It's your choice how you talk and act towards him.

Anne