Am I going to be sick from drinking juice that was carbonated?!

I buy this one brand of White Cranberry Strawberry juice cocktail all of the time and I had a bottle in the closet. I just opened it, poured it over ice and gulped it down and realized that it was slightly carbonated and had a slightly different taste than it usually does. The bottle was pretty bloated too. I've been looking online, and it seems like it probably fermented somehow even though it is way before its use by date. Most people advise to just not drink it at all, but I've already had a decent amount of it.
Am I going to get sick / Is there anything I should do?