Bad episode last night what could it mean?

So I woke up 3 in the morning sweating profusely...started feeling like I need to vomit...and feeling like it was hard to breath...after it started wearing off I felt like I was starving I ate a whole lot and drank alot of water...after wards I felt better but it was scary....im 33 weeks 6 days pregnant and also gestational diabetic...I feel better so I dont want to go to the hospital and i don't have a after hours line to call...its just really bothering me that I don't know what happened....does anyone have a clue?