Screaming making me lose my mind!

My daughter has a limited vocabulary at the moment. She understands me really well, and points to everything around the house wanting to know what things are called. Her doctor is not concerned yet about speech therapy and said we will discuss it in august on her 2nd birthday. The worst part about her not having that much of a vocabulary yet is the fact that she screams in response to everything. Excited? Scream. Angry? Scream. Sad? Scream. Just feel like screaming? Scream. At the top of her lungs, all day long. I’m a single mom, so I deal with it on my own. And I know she’s just trying to express herself. I’ve lost my temper and yelled back at her a few times, but I’ve felt awful. That’s not the type of mom I want to be. Any tips on how to deal with the screaming?