Husband with Depression & Anxiety

Hi everyone. Looking for some advice. Husband has always struggled with depression but it's been horrendous since I found out I'm pregnant. He went back on medication last week after being off it for 6 years :-( It's our first baby and I think he's putting a huge amount of pressure on himself to change it a "Good Dad". Using logic is not working - both the "I wanted a baby with YOU not some abstract ideal of fatherhood" and the "baby will adore you so long as you keep him/her fed, clean, entertained and loved" arguements have fallen flat. I'm too tired and hormonal to do what I would usually do and listen over and over to the way he feels and hand-hold him through this. I'm 4 1/2 months pregnant and I need him to pull it together and help me get sh*t done! He talks about being frightened of loosing his sense of who he is while he's on medication etc and I'm just here thinking "we have so much stuff to do! Random existential dread and philosophical misery will not get our flat baby-proofed!" I can feel myself running out of patience and kindness and feel really guilty about it because I used to be a really solid part of his support network and I feel like I'm letting him down. Have any of you got partners with depression? If so, how do you cope?