Hello, I am almost 21 and I get full extremely fast. It seems that almost every meal I eat either makes me super full right away or kicks me into heartburn and/or nausea. It s gotten to the point where If I m hungry, I ll make myself a meal and immediately chew tums afterword in hopes it will kill the nausea. I m currently underweight BMI-wise (5 10 , 112 lbs) and have a high metabolism, so gaining weight is a problem for me with this condition. I want to be a police officer and I have to meet the weight requirements and even more, I just want the constant nausea to go away. What is it? and What can I do about it?