It is likely that your doctor will run a hormone and thyroid panel on you. Have you ever had these things checked? You could have a number of hormonal imbalances including hypothyroidism. Common symptoms include cold intolerance and low energy levels.....and then there is the weight issues that come along with it......if that is the issue you will have to go on thyroid stimulating medication for the rest of your life. If that is not the issue, then you and your doctor will discuss things like uping your exercise and keeping a food journal. I'm not sure how overweight you are but unless you have serious underlying health problems, your doctor will not recommend Gastric Bypass unless you are approx. 100 lbs overweight. By underlying problems I mean hypertension, diabetes, sleep apnea, heart condition, or joint problems associated with obesity. By no means am I a doctor but I am a nurse and have been down this road myself before. I hope this gave you some insight.
GOOD LUCK!!!!