Sslusser, may I ask if you have both split and planning on getting a divorce why you had not collected your belongings all in one go a before?
I ask this because alcoholic or not, you are both splitting up and she has a right to not have you drop in and out of her life and you feel, she has the right to make boundaries (like getting the door locks changed) to prevent you from just walking in, with no invite.
It all seems to be enmeshed. I actually admire her for setting this boundary and changing the locks, it does not seem fair IMO that you come and go, especially when she is not there and you have not arranged it with her.
I am in the same boat, ex's things still in my house. I have changed my locks. I do not expect him to come into my home now we are split as and when he wants, it is my personal space.
Lilyxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx