So completely overwhelmed

Jamee • 27. Married to the love of my life. Three amazing beautiful blessed children and one on the way due in June 2015.
Currently, I am a stay at home mom to a six year old boy, three year old girl and a one year old boy with a new baby boy due in June. I know that parenting isn't supposed to be easy, I know that being a homemaker isn't supposed to be easy, I just wish that I could get some help to make is a little less overwhelming at 34 weeks pregnant. I wake up and get all three children changed, fed and brushed, get the husband breakfast, start a load of laundry and begin washing dishes. My six year old goes off to school at 8:30am and husband off to work (door to door meat sales). Then I spend the entirety of my day cleaning, changing diapers, making meals, changing more diapers, dishes, laundry etc. I get no help whatsoever. We took my husband's 21 year old cousin in temporarily to help him get on his feet, but he isn't working toward his goal of spreading his wings so much and it is really becoming a thorn in my marriage, hubby won't do anything about it and I am forced to deal with him constantly (doesn't pay rent regularly, doesn't contribute with food or household goods etc). We moved cross country to where his family is and better school systems, 1700 miles away from my family and friends. I know nobody, I live in a town of 200 people, most over 55yrs, 20 minutes drive from anything in any direction, so I don't get the opportunity to leave much. I've been blunt and asked for help, without any vague wording. It's very lonely. I guess I'm just ranting to have someone out there hear, maybe relate.... There's so much more involved, too much for this little post.