No motivation, diet and exercise is not helping.

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I am so frustrated with myself. I have gained almost 20 pounds in about a year and I have been dieting&exercising for the past few months. I'm 5'3 150 pounds and anything and everything I do, it seems as though I am gaining more and more weight everyday. I am completely lost on what to do at this point. I tried dropping my calorie intake to about 1400 cal/per day. Please if you have any advice or feedback feel free to comment. Thank you.