How do I deal with a loved ones PMS?

More specifically, when they treat you as an enemy or expect mind reading abilities and blame you when your not spot on. Then, later when they feel more themselves, come after you for not being able to really be there for them when they are in that state and be ‘strong’ or what have you… when the whole time you stayed through to try to help.. even if it did not have the effect they wanted (i.e. they felt better).