Gaining weight new to this site

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Hello everyone knew to this. I have been trying to gain weight. MFP says that I should be eating 2,360 calories a day. That is so hard considering how thin I am. I am almost 30 years old and I only weigh 89lbs. I have no eating disorders but I do have an overactive thyroid. When I try to force myself to shove 2,000 calories down I start feeling sick from over eating. I need some advice currently drinking ensure with each meal.