Your T's frustration is a bit understandable, although he should have phrased it differently, perhaps. It is hard to watch someone struggle and not be able to make any changes despite discussing them many times. If you cannot or will not set boundaries with your dad, I can see why your T would feel like you just venting about it is useless.

On a practical note, you might wish to consider that negotiating an early termination on your lease would be less expensive than a breakdown or a health crisis, and certainly less traumatic than something going wrong with your pregnancy as a result of your stress levels.