Advice on daughter's health?! please comment!

So to start off my daughter has been gaining weight rapidly since birth practically. First couple years the doctors were never that concerned but now she's about to turn 5 and she weighs 93 pounds.  She's meeting with the endocrinologist next month to get everything checked out. Yesterday, however she had this crazy spell. We were riding in the car on the way to grandmas and she start complaining of being extremely thirsty and then said she was about to vomit. I told her we didn't have anything and we're about 15 mins from grandmas. I then turned back to look at her and she was pale as a ghost and her lips were completely white. Her eyes then started rolling in the back of her head and she was unresponsive but I kept shaking her to keep her from passing out all the way. We then pulled over to wait for an ambulance but I went into crazy mom mode while waiting and told her dad to get in the back while I got in the front and was going 100 down the road and made it in 5 mins. As we pulled up she got the color back in her lips and by the time we got inside she looked completely normal. We stayed for about 5 hours they done ekgs and ran blood tests the only answer we left out with  is to follow up with her pcp and endocrinologist. Her blood sugar was 122 and he said it was a little high but not enough to diagnose her with anything. I just can't stand sitting here worrying and not having hardly any leads. The doctors aren't helping and we're just sitting here hoping that it don't happen again before we can make it to the endocrinologist and "possibly" get answers. Any input and knowledge would be sooo appreciated. I'm so shook up and just want to know my baby is okay.