NaeNae - try not to worry, the chocky milk may have thrown you over but best to get things checked out anyhow. I had GD for #2 and after a few tweaks of my diet had no higher than acceptable BSL readings for the remainder of my pg and bubs was delivered naturally with no intervention and had no issues. Just make sure you eat properly for the lead up to the test and follow their instructions. Most people that fail the first test pass the second.
Don't get too far ahead of yourself, one step at a time. Good Luck.
ETA - Generally a low GI diet/portion control and moderate exercise is the initial treatment. Don't stress about the needles until you have too. xxxx