The Healthy Body Calculator® software uses research-based formulas so the results for your healthy weight and feedback about your weight are based on published research. Yes, you are underweight for height. A healthy weight for you would be 111 to 149 pounds with an average weight or 129 pounds.
It is good you recognize that you may have some food issues like feeling you are going to throw up. Have you thought about talking to a psychologist who specializes in eating disorders before you lose any more weight?
One way to tackle meals is you serve yourself the food you feel you can eat. It should be at least 1 to 2 serving spoons of each food – starches, vegetables, and fruits. A meat serving should be as big as a deck of cards. Add either margarine or salad dressing to 2 foods at each meal. Also, include 8 ounces of milk as your bones need calcium and vitamin D. Use My Plate as a basis for selecting foods to eat as well as serving sizes.