Do talk to a women's shelter. They deal with those issues all the time, and probably have good ideas how to go about in this situation.

Also, where I live there is a place where victims of violence can turn to. There are medical professionals who will document the injuries/the abuse and document them in a way that is forensically recognised (i.e. a court will recognize them). They won't report anyone or call the police unless you want them to. The whole point of this institution is to document proof of the injuries, so people will have the option later on to report the abuser and have valid proof for the abuse. Since you are in Europe, maybe there's something similar where you live (I think this institution is a result of some EU regulation...).

Do you have a doctor you can trust? Maybe have him/her document your injuries as well? (Unless they are forced to report any abuse they might encounter).

All the best, c_r