All my body is swelling, my feet, face breast I guess it is water retention I am in panic?

Hi.i am 21 years old. This summer I had a sudden weight loss after dieting 8 kg in month.After a month I have a increased appetite , heart beats, eye swelling especially in morning, depression, irregular period (once I had 2 period in month) . After 3 month I have sudden constipation and weight gain 2.5 kg. All my body is swelling my feet, face, breasts I guess it is water retention. I am in panic . I have constipation . I can’t walk normally I feel heavy . Please help me!

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