Healthier alternatives for glucose test

Ercmp
So I went for my 1 hour glucose test this morning. Fasted, has blood drawn, finished the drink and thought I was doing well. About 45 min later I started feeling really lightheaded and when I got up to ask if I was allowed to have some water was told no. Next thing I remember was opening my eyes sitting in a chair with 4 nurses around saying to call my doctor so I got scared.  I ended up waiting out my last 15 min and finishing out the test, but am just nervous if the results come back positive and I have to go back for the 3 hr test.  Does anyone know if there are any alternatives? I just don't understand how this test can be a safe thing to put a pregnant woman's body and the baby through. The drink itself is so bad for you that I don't know if I agree with doing it again if need be or when I eventually try with my 2nd.