3 hr glucose FAILED

Any mommas get diagnosed with abnormal glucose intolerance? Just got my test results and they said I have prenatal gestational diabetes and not going to lie I'm kinda freaking out😣 I signed up for a diet class already but I just am like in shock I didn't have it with my first baby and I've lost 20lbs (pre pregnancy weight 230). I've also heard some horror stories about people with the diabetes😭 seriously freaking out any advice or comments are appreciated❤