4meSons, from what I can remember, we suffer with two similar problems, silent migraines and excessive sweating. If you are on the right dose of oestrogen then you should be able to completely eradicate the sweating and at the very least significantly reduce the silent migraines if they are caused by low oestrogen and/or too much progesterone as they are in my case.
Do you know what your migraine trigger is? Did you start getting them once menopausal and just before a period? Did you ever have silent migraines pre-menopause?
I know a lot of women get on well with standard forms of HRT but many do not and you could be one of them. In which case, you need a more tailor made regime and very probably significantly higher levels of oestrogen to get relief. The depression and despondency go hand in hand in low oestrogen levels and low mood associated with migraines - I have never had a silent migraine while feeling good overall. I now use between 2 and 3 pumps of gel every day but when I tried to reduce the dose to 1 pump every day while trying to go for a long cycle, I felt my mood drop and my sense of wellbeing rapidly deteriorate - the sweating started to creep back too.
What type of HRT/dose are you currently using?