I think you should find some other support system for helping you stick with your meds/appointments/balance ASAP. Your family may come around in time, but you need help now and can't wait for them to get their act together, especially if you have three kids at home.

Your job is to take care of you and your kids, not to help your family deal with reality. It's really a shame that they are putting you in this bad position. You know that you have finally found an explanation and it may take time for them to accept that. I would just take a step back from them and their hurtful comments for a bit, if possible.