I am so confused. I get really sick (nausea and throwing up) and my stomach will hurt then 15…

I am so confused. I get really sick (nausea and throwing up) and my stomach will hurt then 15 minutes later my blood sugar feels like it bottoms out. I shake and break out in a cold sweat so I eat a little food to raise it back up and then a little while later I am sick again. I have been doing this since I woke up this morning. I can't tell if it's stress or something else.