Failed My Glucose Test ,, Scared Crazy Now

This is my second son. The only issue I had with my oldest is preeclampsia and I was put into labor a month early but he came out perfect and is 10 and my little prince. Now with THIS boy I had horrible morning sickness to where I had to go get rehydrated at the hospital lost almost 30lbs the first trimester and still at risk for preeclampsia now I failed my glucose test I took Tuesday and have to take a 3hr one. Me being a nervous reck I'm sure is making my health worse so I have no real faith I'm going to pass the second one. And I just want to know if any ladies have had gestational diabetes and what to possibly expect. ?