Some days I really wish I could just disappear
Don't we all. What would happen if you disappear?
My husband will take care of the 3 children
If you are having a mental health crisis you should seek help. It is not right to run away from your family responsibilities.
It's not fair, but I'm suffocating and they won't help me.
Have you tried talking to your husband about how you feel? Maybe he doesn't know that you are feeling so overwhelmed. If he really understood maybe you could get some help from him instead of running away.