Honestly OP, your biggest problem here is your DH. When all this is over please remember how he has treat you, I honestly couldn't forgive his behaviour. What if you were having chemo, or some other treatment which debilitated you? Yes it's a 'ballache' to be picking up the slack when one of you is incapacitated, but he's supposed to love you more than anybody else in the world, he should be doing everything he can to make life more bearable for you.
I can't believe you've shared with him and your parents that you're considering an abortion of a much wanted baby and none of them have stepped up - really fucking shameful, I've got 2 adult daughters, no way would I let them suffer like you are.
I really feel for you OP; I had 2 easy pregnancies but then I fell pregnant for the 3rd time and felt horrendous. I literally couldn't move my head without feeling sick (a bit like when you've drank too much and the room spins) My third pregnancy wasn't planned and I did end it at 10 weeks, more due to the circumstances at the time but honestly, the sickness did contribute to my decision. I remember one day laying on the sofa, the room was spinning and I had to go and pick my daughters up from school - I just cried, never felt anything like it - I totally understand why you're feeling as you do.
Whatever your decision you're gonna have a rough few months ahead of you, please do what you need to do to get through it, even if you have to totally abstain from family life for a bit - if you refuse to do it your DH will have no choice, you look after you if no one else is willing to 