Oh gosh - when did you last have a 'break' and what I mean is maybe leave the baby with his father and go and sit with a coffee and relax? I don't mean this flippantly but it sounds like it is all getting on top of you.
A couple of myth busters - babies do lose their first hair. And now would be normal - as they lie down it fall out where they sleep - my son looked with a monk - hair only on top!
My house isn't always clean or tidy. I try to do a quick rush job in the morning when my 5 month old is most content and it all goes downhill after.
Maybe think of quick food, rather than junk food - quick pesto pasta with some already cooked chicken or tuna? Cous cous salad, stir fry's, jacket potatoes, curry from a jar. 2 min rice in the microwave. Don't beat yourself up on food - you need food to feed your baby.
I am sure your baby is gaining weight - and that means you are doing a fab job.
Now going back to having a break. I was struggling with bottle feeding my first at 8/9 weeks old. He just wouldn't drink much, I spent much time with HV and I started to get so stressed feeding my baby. My partner watched me getting cross with my baby that he wasn't feeding. He booked a single ticket to the cinema and sent me out for 2 hours. Best thing he did and it gave me some headspace, baby was fine and he worked together on changing formula, bottles etc. So that worked for me.
Please bring your partner into this and if you are worried about the hv and after going to clinic daily for a week I was so stressed about the feeding / I was given a piece of advice - if your baby is happy and contented - then you are doing a good job.
Sorry for the rabble hope that make sense