You don't have your nutrition trackers shared, so it's tough to make specific recommendations. I think a consultation with your doctor would be well advised at this point. Carbs are not evil, and will not sabotage your weight loss effort. The trick is choosing the RIGHT carbs: www.sparkpeople.com/resource/nutrition_art
If this is happening a lot, I would be very concerned that you're not eating enough, or may have an underlying medical condition.