Dealing with depression in your partner? (Long, sorry!!)

Just wondering if any of you have a partner that suffers from a depression disorder? I have one myself that I feel I effectively manage and see a therapist regularly. My partner though...I have been worried about him the last few months. Since May it has been one major thing after another. We had a major home invasion and were held at gun point then we found out I was pregnant, then he ended up having to leave his job after the company just completely screwed him. Money is tight, obviously and he just has been so distant. I honestly see him for about 30 seconds a day and the rest of the time he's either at work, working out or trying to do something that makes him feel like he's still progressing towards goals. He very much equates hard work with success, money and value. He refuses to see a therapist, he is a vampire and can't sleep at night and he will stay up and just let his mind rip him apart until he will send me a text and say something like, "I hope your sleeping well, I'm awake and my mind is racing." 
He acknowledges that "something's probably wrong." When I have mentioned that he may have depression (he has cycles where he is great and then every 3 months things get low and sad) and it might be worth coming to a session with me...but, he won't. 
At this point I just don't really know what to do and it really hurts me when I see him like this. I feel helpless. The more 'depressed' he gets the more withdrawn he becomes...and he actually triggered an anxiety attack on me the other day because he was just so not like himself and it scared me, very badly. He's loud and outgoing usually but he wasn't even really able to hold a conversation and was speaking real vague, like he was mentally just so far away. 
This got so much longer than I intended, I apologize!!! Any advice would be awesome. He's a wonderful man and will be a great dad..I just want to help him realize everything's gunna be okay.