Hi @Broken13heart I'm so sorry you are suffering so much, it sounds like you are full of anguish about this decision. It also sounds like you do want to terminate, or feel you must, and I think you should go with your gut on this decision. You are not selfish to terminate, you are doing it for the good of your other children and yourself, if you are exhuasted and unable to cope, it will affect your family. You have dedicated 13 years to children and you deserve to have time for yourself now. Please don't watch the videos and try to accept and forgive yourself. You sound like a lovely mother, especially with your daughters, who you are raising to be strong women. Try to think about what you would say to a friend or your own daughter in your situation - surely you would support her to do what is right for her? Give yourself that love that you would give to a friend.
It sounds like you are very alone if all of your family and your obgyn are pro life. Is there a different doctor you can see? Are there free counselling services available? Which country are you in?
You need to find some support locally. In the UK and some other countries there are womens refuges, and counselling services free of charge. Perhaps you can ask for some advice and help?
If termination is available to you in a safe and sterile environment and it feels like your only option, then you should NOT feel guilty to do it. Many women feel they cannot bring a child into this world and it is your body, it is YOUR choice. It is not your husband's choice, even though of course ideally you would have his support. If he is not going to give you his support then you still have the ability to go ahead. It is your choice. Your body.
I wish you so much luck. Remember, God is forgiving, and will understand. You are not a bad person. xx