my boyfriend is so frustrating. he had chronic pancreatitis so he's sick alot. and if I don't feel…

my boyfriend is so frustrating. he had chronic pancreatitis so he's sick alot. and if I don't feel good it doesn't really matter because he "feels worse". I am 8 months pregnant and miserable. I don't get much help with out two year old because he is in pain. its my job to bring home the income, take care of OUR son when I'm home from work, and make sure that the entire apartment is clean.... sometimes I wonder why I do this. He hasn't had a job in over 3 years and I work my ads off. and now I'm in tears because he went to the gas station to get gateraid and I asked him of he would get gas while he was there and he said no so I got frustrated ... now hes pissed off at me.... and did I mention the money he is using is my money that I work my ass off for? ugh I'm so frustrated. it hurts my heart because I love him so much but i need him to help.