Are Fatigue, Hot Flashes And Weight Gain Post Menopausal Symptoms?

I have been experiencing low energy, fatigue, weight gain (without a change in diet) and I am hot all the time, even in AC. Cannot get cooled down easily. By evening I am dragging. Nothing in my regular routine has changed. With that being said, I have been having a terrible time with sleep. I can go to sleep fairly easily, but have difficulty staying there. I am aware that can be some of the fatigue problem, but there is something going on that is causing all of this. The weight gain is driving me crazy along with constantly being hot. I completed menopause in 2008 and have not had the symptom of it for a few years now. I do not and have not ever taken hormone replacement therapy, nor will I. Just FYI, I clean houses full time so I do not have a sedentary job. I will await your reply.