I am so sorry you are going through. It is a very difficult situation, unfortunately, one that many women have to deal with.
Do you think one of your issues with you going inpatient is he doesn't know how he will handle 3 young children while working and doing whatever else he does. Could some of you family take them long enough for you to go inpatient? This would hopefully speed up the time it takes for you to find a medication that makes you feel better. Once the medication is working better hopefully you would be in a better place to figure out the future with your husband.