Why can't I seem to stop crying at my cat and yelling at my husband?

Anxiety/Depression. Might be anxiety or depression or simply some significant stressful event that has sent your world into a tailspin. The best thing to do is re-evaluate what is making you cry and yell. You can also consider speaking with a therapist since that can provide significant relief.
Discuss with doctor. Sometimes our emotions get the best of us. We get stressed out and take things out on those around us. This can be a result of stress, sleep deprivation and exhaustion. It also can be a sign of depression. It is important to discuss this with your doctor and be evaluated for depression. You can also discuss other life stressors and discuss a plan of action.