Some thoughts...

1) what have added to your diet now that you have not been eating regularly? It may take time for your digestion to adjust to the new and increased amount of food.

2) Have you considered that you may have a gut issue? Possible yeast overgrowth and that maybe you need to add in a good probiotic and limit sugars at first. The bloating and constipation are a strong indicator of a gut imbalance.

3) Calorie counting can be very misleading in that not all calories are created equal. You really have to look for nutrient rich food when trying to modify your weight.

4) What vitamin levels are coming back higher than normal? And are you taking supplements?