Hi, your description is exactly how I am feeling. I am 50 too, my level of concentration is appalling, brain full of fog and the past 6 months I have felt so overwhelmed with my emotions, crying non stop. I too have always suffered on and off from depression but this feels like something else so I have put it partly down to the peri-menopause. I have a telephone consultation with my GP this week and am going to ask to go on HRT. I follow the menopausal doctor on Instagram, Dr Louise Newson I think she is called, her website has some excellent sources of information. I suppose everyone is probably feeling shit at the moment but you know your own body and coupled with your age, I wouldn't rule out it being menopausal related. Good luck x