What do you mean by 'in menopause'?
Menopause is reached when one hasn't had a period for a whole calendar year (or if you're under fifty, two whole years). After this point, you're post-menopause, and before this point, you're in perimenopause.
Perimenopause and even being post-menopause can cause brain fog, headaches too. Both can trigger autoimmune conditions too, along with digestive issues and inhibit weight loss.
Personally, I would start with a women's health specialist or even a GP who specialises in women's health (and menopause) to explore where you are within yourself. Many women's health specialists can also advise re. diet or work closely with a dietician/nutritionist).
When that is all in hand, find a PT who works with women, particularly those in their 40s and 50s as our training needs are different and it's weight and resistance training (and LISS) rather than cardio and HIIT that are most beneficial. If you're in London, Roar is a good place to start but it is expensive. Otherwise, somewhere like StrongHer (also in London) is cheaper.