Hi Alejandra. Welcome to SR. I agree with L2L about finding an al-anon meeting (or several) to attend. Can you find other support as well (such as your family)?
Sometimes just having no contact with the alcoholic is the best way to detach from him.
Just because the phone rings or the doorbell chimes ~ it doesn't mean you have to answer it.
I'm sorry that you are in so much pain... stay strong! Kerbearz