So my girlfriend has BPD, she told me a while ago, not that much. Of course I was noticing before some "unusual" behavior on her (I don't mean anything bad by unusual it's just my first time with someone with BPD and a lot of things are new to me) since the beginning, but to be honest I just heard about this a couple of months ago so didn't even knew it existed, sorry. 

So we were arguing when she told me, I have a strong anxiety disorder so it was really hard for me to handle some situations, and still now it is sometimes. I was having a really bad time after the argument and suddenly she told me out of nowhere, I mean I'm not complaining at least she made the effort for telling me, I know it was not easy. Since then nothin has really changed, and I don't really mean it in a good way. She's been swinging around moods more constantly, the bad moods are a lot more "stronger", I'm sometimes really afraid of how to act because I'm worried I will trigger something...etc.

She's not into therapy or medication, she refuses because as she says "she is not crazy" , I tried to explain her that those things are not for "crazy" people but she's kind of afraid of starting with these two things, and it doesn't look like it's an option to think about those at least now.

I don't really know how I'm supposed to act for example if she goes all silent and distant in a sec, should I just leave her alone? Try to talk even if I'm not getting anything?

She's also starting to show symptons of depression so it doesn't really help. 

I know I should be patient but I'm not made of stone and sometimes there a things that are really hard to deal with and that triggers me so much. Of course even so I love her I would want to help or support as much as I can but I just don't know how.