Struggling with Anxiety and Depression: How to Handle Negativity?

I am having a really hard time right now with my anxiety, depression, feeling hopeless and with my negativity. My partner came to me today and told me that I need to watch out with this negativity because It's affecting him as well. I got all defensive and frustrated because in my mind I feel it's unfair to come to me complaining that my negativity is bothering him when I am the first one who is affected by it. It just feels really unfair that I am trying so hard to hold on and suffering so much from my state of mind right now and on top of that I have to hear someone complaining that my negativity is making their life difficult. I don't know what to do about this. I am trying to control my negativity for my sake and I am failing how could they possibly think if I can't succeed for my sake that I would be able to succeed for their sake? How do I do to not make their life difficult or to make them understand that I am the first one who's suffering from the way my brain works presently and that I'm trying and I've been trying my whole life.