Depressed Sad Mummy

I have been very depressed and sad lately. Im pregnant my husband is something else I don't even want to hear about him. My life is Jst sad. And I get angry at my 2 year old son alot.... Why can a man Jst be there for his wife in the time of need....why life has to be so sad all the time when does happiness come..... 3 years and getting worse..... What can I do to get my mind of everything. I'm a stay at home mom I don't work have no money suggest something that doesn't have to do with money.... I want to work bt no body want to hire me cause I'm pregnant