Hunger is so extreme I feel like crying. Is this normal?

For days I have had non stop hunger pangs. No food satisfies the hunger. I had two bowls of pasta for dinner and I felt like I didn’t eat anything. The gnawing feeling in my stomach is not going away. I have a normal appetite typically. I’m very thin so I’m not worried about eating too much but I am SO uncomfortable it’s unbelievable. It feels like the food isn’t even hitting my stomach. My period is due today. Could that be why? Or could something else be wrong? And how do I stop this discomfort when eating doesn’t do a single thing? Early 20s female. No medical history. No medications.