How To Cure Fatigue Due To Weight Gain?

Hi I am a 38 years of age woman, I wonder if I might have an estrogen disbalance or hypotyroidism or adrenal malfunction:my symptoms are great fatigue during the day and weight gain as much as 50 pounds in the course of a year while being very self counciouse about haveing a healthy nutrition, I feel always sleepy, I am down emotionaly, it has become almost impossible to loose a pound for me!and my periods shrank from 7 days to total of 3 for each month again during last year, and I have hot flushes constantly, I never crave sweets but my hunger would be satisfied just by solty taste and I have over active bladder as much as twice each hour but have no problem with bowl moovement it is regular on daily basis.