I am a 50 year old female. I have recently had a weight gain of 20 lbs even though my diet has not changed. I have low energy and fatigue easily. I have some pain on my left side of my back in the middle to lower section of my back. I also have an intermittent feeling of fullness in my abdomen. My left arm seems to have small nodules under the skin that I wondering if they are swollen lymph nodes. I'm also experiencing night sweats. I had what appeared to be the flu in February and have not a menstrual cycle since. I have had achalasia for the past 30 years. I recently had a colonoscopy which showed no polyps or other issues. I just don't feel normal and the weight gain is a concern to me. Are my symptoms related to menopause or is there something else going on?