If your overall health is not good, trying to fix your hormones will not work. Your body is made to work together as a whole; if one part isn't doing it's job, the other parts can't do theirs.
Being overweight and out of shape makes it harder for your body to do it's jobs: Breathing, pumping blood, nerves, bones, ligaments. That's a lot to do! Having excess fat hanging around pushes the bones, nerves and ligaments out of the places they're supposed to be, causing pain.
Think about it like this: Your body is a skyscraper, with a frame. Your bones are the frame. They need to touch in certain places and be held together in other places by ligaments, tendons and muscles. When those muscles are strong, they support the ligaments and tendons (and visa versa), keeping the bones (frame) where they need to be.
Adding 30 pounds of fat is going to take the space originally held by the worker fibers (muscles, tendon and ligaments). Fat is not a worker fiber, it is just fat. It hangs on the worker fibers like a drunk friend at the end of a night of partying, making it hard to work. The worker fibers become irritated (inflammation) and fatigued from having to their job AND drag around the fat. Hips, knees and feet give up and suddenly you find yourself limping.
Taking care of your body is the first place to start. Just 20 minutes a day, everyday, will make a big difference in any body's health. Take the dog for a walk or lace up your running shoes and go for a run. Start slow, but start now. Within weeks not only will be pounds be melting away, but the hot flashes could also be toning down.
Personally, I found I needed a 40 minute workout that included 20 minutes on the elliptical and 20 minutes of using the universal lifting equipment, 4 - 6 times a week. After a few weeks the intensity and frequency of my hot flashes had diminished enough I could at least sleep through most nights. Which was a much needed improvement.