Help. I feel like I’m loosing my mind. 

My partner suffers from anxiety and panic disorder as well as spouts of depression. The past three months have been pretty overwhelming for us for a lot of reasons. We started couples counseling and that seems be helping a bit but I’m honestly still having a really hard time supporting him. 

His anxiety seems to come out of no where. Like we’ll be having a great time playing video games together and then just bang- he’s being short, sad, indecisive and just (what feels like) difficult to communicate with. 
It almost feels like he’s mad at me or just trying to cause a riff. 

Eventually he’ll explain that he’s either sad or anxious about something. 
But during the time where he won’t tell me what’s wrong and just acting rude I just feel frustrated and tired of trying to be supportive even though I literally have no idea what’s going on.

I’ll try to give him space and also calm myself down but he will just persistently ask ‘me’ what’s wrong (which feels incredibly obvious to me). 

When we try to actually talk about any of these situations (aka I explain why I’m frustrated) he will just cut me off, start, crying and will go into “I’m so sorry, I’m SO sorry. but I can’t control when I get anxious”

And this is literally the most frustrating part. Because for me, I am SO aware that he is not in control of being anxious and I don’t want him to apologize for having that experience. Every time he goes into “I’m so sorry, I’m so sorry” mode I just end up feeling guilty for expressing my feelings and then feeling like I now have the new job of making him feel like it’s all okay. 

I feel like the second I explain how I feel I’m no longer allowed to feel it. And I am so tired of this situation.

Please give me advice/explain to me what is going on here. 

Our relationship is the most important thing to both of us, but this is a consistent road block and I don’t know how to keep navigating this.