Well OP you certainly sound bad tempered enough to be menopausal! 
I had that myself, until I went to my doctor and she gave me a blood test to rule out anything else, like cancer, and she was then able to diagnose me as having started my menopause,. She also gave me a full examination, which ruled out anything, like, you know, cancer.
If you want to sit in misery being snippy with random people on the Internet, and have your enlarged tits poked by your granddaughter (while you could have ovarian cancer), that's up to you.
Personally I find hrt has helped me tremendously, but I had to go to a doctor and get prescribed. That's how it works.
If you're dead certain against going to a professional health care practitioner, OP, maybe you could polish up a crystal, align yourself with the west wind on a full moon and eat your homeopathic lentils. Who knows, it might even be better than arguing with a bunch of vipers on the Internet 
Not quite correct hooliodancer, even disturbed sleep, changes to your body and weight, grumpiness with patchy periods can be diagnosed as meno with a blood test and examination and hrt can be prescribed.
You don't need to crawl in to your GP, divorce papers in your sweaty hand weeping, raging, and at the end of your tether, if you go to your doctor and discuss symptoms. Maybe your thyroid has packed in, but you won't know until you see a doctor, and been diagnosed.
There is a menopause section on mumsnet. There are a lot of lovely experienced ladies over there who are sharing their experiences.
All of them say go to a doctor first as you need to be seen if things are changing and you can't find out the reason why, as it could be something more serious, like ovarian cancer and no one can diagnose from behind a screen.