Ours, but theirs

I am constantly belittled an blamed. That the problem is because of me. I researched this disorder when I heard it in an appropriately titled movie 'the expendables'. She checked the history on the home pc after using google.
When she found it, she kept it to herself. As did I. Then she questioned me. I told her why. Then she flew into a fit of rage. Yelling and screaming at me in front of our children. Telling me it was all my fault. At that time, she hadn't told me what her illness was. I felt misunderstood. Having had to leave several times, she then goes into a state where it's my fault and I have no friends left. I am worried for our children, she treats them as blame now, saying they are a burden to her. Saying she wishes she never had them! But when I ask to have them in my care. She just says you are trying to take them away, and cut my money off from centrelink. I am in a rock and a hard place! I don't want to hurt her, but I don't want to see our children hurt. Money problem, is because we were saving for our own home. But she encouraged me to spend it on a newer car. Now we have no savings, and a credit card debt up to the max. And I get the blame!
Should I seek help immediately?