Husband being an ass

I am 20 weeks pregnant and my husband has been being nothing but a jerk to me. If I ask for his help he either ignores me or yells at me and I constantly try to tell him that it's not as easy for me to do the stuff I used to because I am tired or I don't want to lift heavy things. He constantly is working on the house so every night I come home from working a 10 hour day to make dinner he comes in eats with me and then Leaves the table to go work again before I am even done. Then I go to bed early and don't see him and repeat its a daily thing... I constantly ask him to spend time with me and he never wants to so I get aggravated about sitting alone every night. Also we recently were told that there is a very high chance our baby girl will be born with Down syndrome and I have been very emotional about it and he will not talk to me about it and then I sit alone all night dwelling and worrying and I don't really have anyone else to talk to about it because all my friends don't really understand.. No one really understands. I have been feeling very alone and depressed and I am more likely to snap at him for little things because I am building resentment and I am hormonal. I just feel like whatever I do is never good enough. We got into a fight this morning because I was cooking breakfast and the bacon was burning and I asked for his help but instead he yelled at me about burning the bacon and then I asked him to get me a pan and he yelled at me and said not when you act like that and walked into the other room and ignored me... Not when I act like what??? All I was doing was asking for help so I wouldn't burn breakfast and it turned into a huge fight. I don't get it... All I want sometimes is for him to go a little out of his way to do something nice for me.... I am carrying his baby for gods sake. He also needs to understand all the stress I have going on with work and being a high risk pregnancy and my doctors sucking and i feel like our families want us to keep it a secret that there may be something going on with the baby... But why should I be ashamed??? It's my baby regardless and their family as well. I just can't catch a break!! I lost my dad before our wedding and thought getting pregnant would be this amazing happy thing and now I have to deal with all this. It's just not fair!