Yes, I have felt that way alot. Some days I feel like running a marathon but most days just walking in a store I feel like you said, like I have been walking for 24 hours. Other than support I have no idea how to help you. Any replies you get for remedies on this topic would help me too. I am newly diagnosed. My diagnosis is premature menopause but actually right now I am perimenopausal. Any support you could give me would help me too.